A uniform grouting device and method for a cast-in-place pile

Abstract

This invention relates to the field of pile foundation engineering technology, specifically disclosing a uniform grouting device and method for cast-in-place piles. The uniform grouting device for cast-in-place piles is characterized by comprising: a reinforcing cage; a grouting pipe assembly disposed within and connected to the reinforcing cage; a grouting mechanism disposed within and connected to the grouting pipe assembly; and a steering drive mechanism disposed within the grouting pipe assembly and driven by the grouting mechanism, the steering drive mechanism being used to adjust the grouting direction of the grouting mechanism. This invention has the advantage of being able to uniformly grout each grouting location according to its respective grouting parameters, thereby effectively reinforcing the soil around the pile, increasing pile side resistance, and reducing settlement.

Description

Technical Field

[0001] This invention relates to the field of pile foundation engineering technology, and in particular to a uniform grouting device and grouting method for cast-in-place piles. Background Technology

[0002] Considering the complexity of geological conditions, post-grouting construction of cast-in-place piles often encounters problems such as grout seepage from the ground, grout cross-contamination, uneven grouting at different locations, and unstable control of the grouting process. This results in the post-grouting process failing to achieve the expected results: improving the mud cake on the pile side and stress relaxation of the surrounding soil, enhancing the bearing capacity of the pile foundation, and reducing settlement. Existing pile-side grouting processes require the arrangement of vertical pile-side grouting pipes or a straight grouting pipe connected to a grouting ring pipe along the pile's penetration depth. The former involves symmetrically arranging 3 to 4 pile-side grouting pipes around the pile, but the grouting heads of each pipe are not connected, and grouting pipes at different depths are also not connected. The latter connects the grouting heads at the same horizontal position through a ring pipe, but this cannot guarantee that the grouting heads at the same position start grouting simultaneously, nor can it guarantee consistent grout output from each grouting port. The grouting head closer to the straight pipe may output the most grout, while the grouting head furthest from the straight pipe may output the least, failing to guarantee uniform grouting. Both of these grouting pipeline layout methods consume a lot of materials, require a large amount of work during installation, and require multiple people to cooperate. Grouting can be interrupted due to malfunctions, and the pipelines are prone to blockage, which seriously affects work efficiency and grouting effect. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of the present invention is to provide a uniform grouting device and grouting method for cast-in-place piles, which has the advantages of being able to uniformly grout each grouting position according to its own grouting parameters, thereby effectively reinforcing the soil around the pile, increasing the pile side resistance, and reducing settlement.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A uniform grouting device for cast-in-place piles, characterized in that it comprises:

[0006] Reinforcing cage;

[0007] Grouting pipe assembly, wherein the grouting pipe assembly is disposed inside the reinforcing cage and connected to the reinforcing cage;

[0008] The grouting mechanism is disposed within the grouting pipe assembly and connected to the grouting pipe assembly;

[0009] A steering drive mechanism is disposed within the grouting pipe assembly and is connected to the grouting mechanism for transmission. The steering drive mechanism is used to adjust the grouting direction of the grouting mechanism.

[0010] Compared with the prior art, this application achieves uniform grouting by setting the grouting mechanism inside the grouting pipe and adjusting the grouting direction of the grouting mechanism through a steering drive mechanism.

[0011] As a preferred embodiment of the present invention, the grouting pipe assembly includes an outer grouting pipe and an arc-shaped sleeve, the arc-shaped sleeve being disposed on the outer grouting pipe and connected to the reinforcing cage;

[0012] The grouting mechanism is located inside the grouting outer pipe and passes through the arc-shaped sleeve, while the steering drive mechanism is located inside the arc-shaped sleeve and is connected to the grouting mechanism for transmission.

[0013] Using the above scheme, the arc-shaped sleeve can provide installation space for the steering drive mechanism, and the grouting outer pipe can provide installation space for the grouting mechanism. Furthermore, the arc-shaped sleeve is set on the grouting outer pipe, and both are set along the length of the reinforcing cage. During grouting, the grouting mechanism can more smoothly probe to the grouting position.

[0014] As a preferred embodiment of the present invention, the grouting mechanism includes at least one grouting component. When there are two or more grouting components, the two grouting components are connected by a connecting pipe. The grouting outer pipe is provided with a one-way valve and a grout outlet pipe at the location of the grouting component.

[0015] Using the above scheme, when there are two or more grouting components, they can be connected by connecting pipes to form a serial grouting rod, and the one-way valve can effectively prevent grout backflow.

[0016] As a preferred embodiment of the present invention, the one-way valve is disposed inside the arc-shaped sleeve and connected to the grouting outer pipe, the grout outlet pipe is disposed through the arc-shaped sleeve and rotatably connected to the one-way valve, and a driven wheel is disposed on the grout outlet pipe.

[0017] With the above-mentioned scheme, the grout outlet pipe is rotatably connected to the one-way valve. The grout outlet pipe can rotate under the action of the steering drive mechanism to adjust the grouting direction, thereby further improving the uniformity of grouting.

[0018] As a preferred embodiment of the present invention, the grouting assembly includes a grouting inner tube, both ends of which are provided with threaded portions. The grouting inner tube is threadedly connected to the connecting pipe through the threaded portions. Two sets of sealing components are provided on the grouting inner tube, and a grouting port is provided on the grouting inner tube between the two sets of sealing components.

[0019] Using the above solution, the grouting inner pipe can be connected to the connecting pipe through the threaded part. When the grouting inner pipe is located inside the grouting outer pipe, the two sets of sealing components and the grouting outer pipe can form a grouting cavity. The grout flows from the grouting port on the grouting inner pipe into the grouting cavity, and then passes through the one-way valve and the grout outlet pipe in sequence to be discharged, which can effectively prevent the problem of grout overflowing the grouting cavity.

[0020] As a preferred embodiment of the present invention, the sealing assembly includes a sealing plug, which is sleeved on the grouting inner tube, and a sealing ring is sleeved on the sealing plug.

[0021] Using the above-mentioned solution, the cooperation between the sealing plug and the sealing ring can ensure that the grout is inside the grouting cavity.

[0022] As a preferred embodiment of the present invention, the steering drive mechanism includes a drive motor and a transmission belt. A drive gear is provided on the drive shaft of the drive motor. The transmission belt is wound around the drive gear and the grouting mechanism, and the transmission belt is meshed with the drive gear and the grouting mechanism respectively.

[0023] With the above-mentioned scheme, the transmission belt is meshed with the drive gear and the driven wheel respectively. By controlling the operation of the drive motor, the rotation of the grout pipe can be controlled, thereby adjusting the grout discharge direction and effectively improving the uniformity of grouting.

[0024] A grouting method using the above-mentioned uniform grouting device for cast-in-place piles includes the following steps:

[0025] S1. Install grouting pipe assembly and steering drive mechanism on the reinforcing cage;

[0026] S2. The steel cage is lowered in sections. While connecting two sections of the steel cage, the grouting pipe assemblies are also connected. The grouting pipe assemblies on each section of the steel cage are connected.

[0027] S3. After the construction of the cast-in-place piles is completed, the work shall be suspended until the post-grouting start time requirement specified in the standard is met.

[0028] S4. Grouting parameters for different grouting locations are obtained through indoor tests. The grouting parameters include grouting pressure, grouting volume, and grouting interval time. The location of the one-way valve is the grouting location.

[0029] S5. Judge the grouting parameters of each grouting location in the same soil layer. If the grouting parameters of each grouting location are consistent, perform cyclical alternating grouting for each soil layer. Otherwise, perform cyclical alternating grouting for each grouting location. During the grouting process, the steering drive mechanism controls the rotation of the grout outlet pipe.

[0030] The above-mentioned uniform grouting device and grouting method for cast-in-place piles have the following beneficial effects: they can effectively perform differentiated grouting operations at different depths and soil layers; they can organize and design grouting operation processes at different locations according to the grouting pressure, grouting volume, and interval time required to form an effective grout morphology on the pile side based on soil layers at different depths; and achieve uniform grouting at each location. This effectively avoids situations such as grout not solidifying properly in the soil layer due to unreasonable grouting operation parameters, resulting in grout leakage and other problems. At the same time, the use of cross-grouting operations improves the efficiency of grouting operations, thereby reinforcing the soil on the pile side, increasing pile side resistance, and reducing settlement. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a uniform grouting device for cast-in-place piles according to the present invention;

[0032] Figure 2 This is a partial schematic diagram of a uniform grouting device for cast-in-place piles according to the present invention;

[0033] Figure 3 This is a schematic diagram of the grouting component in a uniform grouting device for cast-in-place piles according to the present invention;

[0034] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0035] Figure 5 This is a flowchart of a uniform grouting method for cast-in-place piles according to the present invention;

[0036] In the diagram: 1. Reinforcing cage; 2. Grouting pipe assembly; 21. Outer grouting pipe; 22. Arc-shaped sleeve; 3. Grouting mechanism; 31. Grouting assembly; 311. Inner grouting pipe; 312. Threaded part; 313. Sealing assembly; 3131. Sealing plug; 3132. Sealing ring; 314. Grouting port; 32. Connecting pipe; 33. One-way valve; 34. Grout outlet pipe; 35. Driven wheel; 4. Steering drive mechanism; 41. Drive motor; 42. Transmission belt; 43. Drive gear.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] This invention proposes a uniform grouting device and grouting method for cast-in-place piles.

[0042] Reference Figure 1 In one embodiment of the present invention, a uniform grouting device for cast-in-place piles is characterized by comprising: a reinforcing cage 1, a grouting pipe assembly 2, a grouting mechanism 3, and a steering drive mechanism 4. The grouting pipe assembly 2 is disposed within and connected to the reinforcing cage 1; the grouting mechanism 3 is disposed within and connected to the grouting pipe assembly 2; and the steering drive mechanism 4 is disposed within the grouting pipe assembly 2 and is drively connected to the grouting mechanism 3. The steering drive mechanism 4 is used to adjust the grouting direction of the grouting mechanism 3. By disposing of the grouting mechanism 3 within the grouting pipe and adjusting the grouting direction of the grouting mechanism 3 through the steering drive mechanism 4, uniform grouting is achieved.

[0043] Reference Figure 1 and Figure 2In one embodiment, the grouting pipe assembly 2 includes a grouting outer pipe 21 and an arc-shaped sleeve 22. The arc-shaped sleeve 22 is welded to the grouting outer pipe 21 and connected to the reinforcing cage 1 by welding. A grouting mechanism 3 is disposed within the grouting outer pipe 21 and passes through the arc-shaped sleeve 22. A steering drive mechanism 4 is disposed within the arc-shaped sleeve 22 and is connected to the grouting mechanism 3 for transmission. The arc-shaped sleeve 22 provides installation space for the steering drive mechanism 4, and the grouting outer pipe 21 provides installation space for the grouting mechanism 3. Both the arc-shaped sleeve 22 and the grouting outer pipe 21 are arranged along the length of the reinforcing cage 1, allowing the grouting mechanism 3 to more easily reach the grouting position during grouting.

[0044] Reference Figure 2 and Figure 3 In one embodiment, the grouting mechanism 3 includes at least one grouting component 31. When there are two or more grouting components 31, the two grouting components 31 are connected by a connecting pipe 32. The grouting outer pipe 21 is provided with a one-way valve 33 and a grout outlet pipe 34 corresponding to the grouting component 31. It is worth noting that the grouting outer pipe 21 is connected to the arc-shaped sleeve 22 through the one-way valve 33. When there are two or more grouting components 31, they can be connected by the connecting pipe 32 to form a serial grouting rod. The one-way valve 33 can effectively prevent grout backflow.

[0045] Reference Figure 2 In one embodiment, the one-way valve 33 is located inside the arc-shaped sleeve 22 and welded to the grouting outer pipe 21. The grout outlet pipe 34 is installed through the arc-shaped sleeve 22 and rotatably connected to the one-way valve 33. A driven wheel 35 is welded to the grout outlet pipe 34. The grout outlet pipe 34 is an elbow-shaped grout outlet pipe 34. The grout outlet pipe 34 is rotatably connected to the one-way valve 33 and can rotate under the action of the steering drive mechanism 4 to adjust the grouting direction, thereby further improving the uniformity of grouting.

[0046] Reference Figure 3 In one embodiment, the grouting assembly 31 includes an inner grouting tube 311, both ends of which are provided with threaded portions 312. The inner grouting tube 311 is threadedly connected to the connecting pipe 32 through the threaded portions 312. Two sets of sealing components 313 are provided on the inner grouting tube 311, and a grouting port 314 is provided on the inner grouting tube 311 between the two sets of sealing components 313. The inner grouting tube 311 can be connected to the connecting pipe 32 through the threaded portions 312. When the inner grouting tube 311 is located inside the outer grouting tube 21, the two sets of sealing components 313 and the outer grouting tube 21 can form a grouting cavity. Grout flows from the grouting port 314 on the inner grouting tube 311 into the grouting cavity, and then passes through the one-way valve 33 and the grout outlet pipe 34 in sequence to be discharged, which can effectively prevent the grout from overflowing the grouting cavity.

[0047] Reference Figure 3 and Figure 4 In one embodiment, the sealing assembly 313 includes a sealing plug 3131, which is sleeved on the grouting inner tube 311. A sealing ring 3132 is fitted onto the sealing plug 3131. In this embodiment, the sealing plug 3131 is a frustum-shaped sealing plug 3131, and the sealing ring 3132 is a closed sealing ring 3132. The cooperation between the sealing plug 3131 and the sealing ring 3132 ensures that the grout is within the grouting cavity.

[0048] Reference Figure 2 In one embodiment, the steering drive mechanism 4 includes a drive motor 41 and a transmission belt 42. A drive gear 43 is welded to the drive shaft of the drive motor 41. The transmission belt 42 is wound around the drive gear 43 and the driven wheel 35, and the transmission belt 42 is meshed with the drive gear 43 and the driven wheel 35 respectively. The drive motor 41 can be fixedly installed on the ground or on a workbench, as long as the drive motor 41 can be fixedly installed, which will not be elaborated further. The transmission belt 42 is meshed with the drive gear 43 and the driven wheel 35 respectively. By controlling the operation of the drive motor 41, the rotation of the grout pipe 34 can be controlled, thereby adjusting the grout discharge direction and effectively improving the uniformity of grouting.

[0049] Reference Figure 5 In one embodiment of the present invention, a grouting method utilizing the above-mentioned uniform grouting device for cast-in-place piles includes the following steps:

[0050] Step S1: Install the grouting pipe assembly and steering drive mechanism on the reinforcing cage;

[0051] Step S2: The steel cage is lowered in sections. While connecting every two sections of the steel cage, the grouting pipe assemblies are also connected. The grouting pipe assemblies on each section of the steel cage are connected.

[0052] Step S3: After the construction of the cast-in-place piles is completed, rest until the post-grouting start time requirement specified in the standard is met;

[0053] Step S4: Obtain grouting parameters for different grouting locations by conducting indoor tests on the relationship between soil depth, soil properties and grout formation at different grouting locations. Grouting parameters include grouting pressure, grouting volume and grouting interval time. The location of the one-way valve is the grouting location.

[0054] Step S5: Determine the grouting parameters of each grouting location in the same soil layer. If the grouting parameters of each grouting location are consistent, perform cyclical alternating grouting on each soil layer; otherwise, perform cyclical alternating grouting on each grouting location. During the grouting process, the steering drive mechanism controls the rotation of the grout outlet pipe.

[0055] In this embodiment, when the grouting parameters at various grouting locations within the same soil layer are consistent, the soil layers are sequentially numbered, such as using G1, G2, G3, and G4 to represent different soil layers. Similarly, the grouting locations are sequentially numbered, for example using F1, F2, F3…F9, F10 to represent different grouting locations. Since the grouting parameters at various grouting locations within the same soil layer are consistent, the grouting parameters at the grouting location within that soil layer are the grouting parameters for that soil layer. The grouting parameters for each soil layer are compiled as shown in Table 1.

[0056]

[0057] Table 1 shows that the grouting parameters at each grouting location in the same soil layer are consistent.

[0058] Referring to Table 1, F1 and F2 are located in the same soil layer G1, F3 to F5 are located in the same soil layer G2, F6 and F7 are located in the same soil layer G3, and F8 to F10 are located in the same soil layer G4. The grouting process is as follows: A serial grouting rod consisting of two grouting components connected by a connecting pipe is lowered into the outer grouting pipe to the corresponding F1 and F2 positions. Grouting is performed on soil layer G1 according to the first grouting pressure of P1-1 and the grouting volume of Q1-1. After the first grouting of soil layer G1 is completed, during the interval t1, grouting is performed on soil layer G... 2. Grouting is carried out according to the grouting pressure P2-1 and the grouting volume Q2-1. After the first grouting of soil layer G2 is completed, the second grouting of soil layer G1 is carried out according to the grouting pressure P1-2 and the grouting volume Q1-2 during the interval t2. The second grouting of soil layer G2 is carried out according to the grouting pressure P2-2 and the grouting volume Q2-2 during the interval t1. At this time, the alternating grouting of soil layer G1 and soil layer G2 is completed. The grouting principle of soil layer G3 and soil layer G4 is similar to that above, and will not be repeated here.

[0059] In another embodiment, when the grouting parameters at different grouting locations within the same soil layer are inconsistent, the grouting locations are sequentially numbered, for example, using F1, F2, F3…F9, F10 to represent different grouting locations. The grouting parameters for each grouting location are shown in Table 2.

[0060]

[0061] Table 2 shows inconsistent grouting parameters at different grouting locations within the same soil layer.

[0062] Referring to Table 2, the grouting process is as follows: A grouting component is placed inside the grouting outer pipe and positioned at grouting location F1. Grouting is performed for the first time at grouting location F1 with a grouting pressure of P1-1 and a grouting volume of Q1-1. During the interval t1, grouting is performed for the first time at grouting location F2 with a grouting pressure of P2-1 and a grouting volume of Q2-1. During the interval t2, grouting is performed for the second time at grouting location F1 with a grouting pressure of P1-1 and a grouting volume of Q1-2. During the interval t1, grouting is performed for the second time at grouting location F2 with a grouting pressure of P2-1 and a grouting volume of Q2-2. At this point, the grouting of grouting locations F1 and F2 is completed. The grouting principle for the remaining locations F3 to F10 is similar to the above and will not be repeated here.

[0063] By employing the two different alternating grouting methods described above, differentiated grouting operations at different depths and soil layers can be effectively implemented. The grouting pressure, volume, and interval time required to achieve the desired grout morphology at different soil depths can be determined based on the specific soil layer. This allows for the design and organization of grouting procedures at different locations, ensuring uniform grouting at each location. This effectively prevents the grout from failing to solidify properly in the soil layer due to unreasonable grouting parameters, thus avoiding issues such as grout leakage and spillage. Furthermore, the use of cross-grouting operations improves grouting efficiency, thereby reinforcing the soil around the pile, increasing pile resistance, and reducing settlement.

[0064] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A uniform grouting device for cast-in-place piles, characterized in that, include: Reinforcing cage; Grouting pipe assembly, wherein the grouting pipe assembly is disposed inside the reinforcing cage and connected to the reinforcing cage; The grouting mechanism is disposed within the grouting pipe assembly and connected to the grouting pipe assembly; A steering drive mechanism is disposed within the grouting pipe assembly and is connected to the grouting mechanism for transmission. The steering drive mechanism is used to adjust the grouting direction of the grouting mechanism. The grouting pipe assembly includes an outer grouting pipe and an arc-shaped sleeve, the arc-shaped sleeve being disposed on the outer grouting pipe and connected to the reinforcing cage; The grouting mechanism is disposed inside the grouting outer pipe and passes through the arc-shaped sleeve, and the steering drive mechanism is disposed inside the arc-shaped sleeve and is connected to the grouting mechanism for transmission. The grouting mechanism includes at least one grouting component. When there are two or more grouting components, the two grouting components are connected by a connecting pipe. The grouting outer pipe is provided with a one-way valve and a grout outlet pipe at the location of the grouting component. The one-way valve is disposed inside the arc-shaped sleeve and connected to the grouting outer pipe. The grout outlet pipe passes through the arc-shaped sleeve and is rotatably connected to the one-way valve. A driven wheel is disposed on the grout outlet pipe. The grout outlet pipe is an elbow grout outlet pipe. The steering drive mechanism includes a drive motor and a transmission belt. A drive gear is provided on the drive shaft of the drive motor. The transmission belt is wound around the drive gear and the grouting mechanism, and the transmission belt is meshed with the drive gear and the grouting mechanism respectively.

2. The uniform grouting device for cast-in-place piles according to claim 1, characterized in that: The grouting assembly includes a grouting inner tube, both ends of which are provided with threaded portions. The grouting inner tube is threadedly connected to the connecting pipe through the threaded portions. Two sets of sealing components are provided on the grouting inner tube, and a grouting port is provided on the grouting inner tube between the two sets of sealing components.

3. The uniform grouting device for cast-in-place piles according to claim 2, characterized in that: The sealing assembly includes a sealing plug, which is sleeved on the grouting inner tube, and a sealing ring is fitted on the sealing plug.

4. A grouting method for a uniform grouting device for cast-in-place piles as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Install grouting pipe assembly and steering drive mechanism on the reinforcing cage; S2. The steel cage is lowered in sections. While connecting two sections of the steel cage, the grouting pipe assemblies are also connected. The grouting pipe assemblies on each section of the steel cage are connected. S3. After the construction of the cast-in-place piles is completed, the work shall be suspended until the post-grouting start time requirement specified in the standard is met. S4. Grouting parameters for different grouting locations are obtained through indoor tests. The grouting parameters include grouting pressure, grouting volume, and grouting interval time. The location of the one-way valve is the grouting location. S5. Judge the grouting parameters of each grouting location in the same soil layer. If the grouting parameters of each grouting location are consistent, perform cyclical alternating grouting for each soil layer. Otherwise, perform cyclical alternating grouting for each grouting location. During the grouting process, the steering drive mechanism controls the rotation of the grout outlet pipe.

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