Exposed connector of grouting pipe at pile splicing position of prefabricated square pile
By pre-embedding the grouting pipe on the side of the prefabricated solid square pile and locking it with exposed connection joints at the connecting piles, the problem of slurry leakage at the grouting pipe connection in the prefabricated solid square pile is solved, and the effective connection and sealing of the grouting pipe is achieved.
Patent Information
- Application Number
- CN202420703249.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-07
AI Technical Summary
The prior art is difficult to effectively promote post-grouting technology in prefabricated solid square piles, especially in the grouting pipe connections, where there is a problem of slurry leakage.
An exposed connecting joint is designed to ensure the sealing of the grouting pipe at the connection of the grouting pipe by prefabricating the grouting pipe on the sides of the upper and lower sections, and locking with corresponding notches and joints at the connecting piles.
The sealing at the grouting pipe connection is achieved, the slurry leakage problem is avoided during high-pressure grouting, the sufficient grouting volume of pile tips is ensured, and the construction process is simplified.
Smart Images
Figure CN222614212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building construction, and particularly relates to an exposed connection joint of a grouting pipe at a prefabricated square pile connection point. Background Art
[0002] The post-grouting technology of bored piles has the following advantages in engineering construction:
[0003] 1. Improve the bearing capacity of a single pile: Grouting can solidify the sediment and mud skin at the bottom of the pile, thereby greatly improving the bearing capacity of the pile. According to data, if the bearing layer at the bottom of the pile is fine-grained soil, the bearing capacity of a single pile can be increased by as much as 30% to 70%.
[0004] 2. Reduce project cost: The use of post-grouting technology can reduce the pile diameter, shorten the pile length, and avoid penetrating difficult geological soil layers, thereby reducing construction difficulty and greatly shortening the construction period.
[0005] Post-grouting technology is generally only applicable to bored piles.
[0006] Precast piles are divided into two categories: precast hollow piles and precast solid piles. Precast concrete solid square piles are widely used in the field of civil engineering, especially in areas where pile foundations have anti-corrosion requirements. They have the advantages of convenient supply and low price.
[0007] Due to the characteristics of the precast solid pile, it is difficult to promote the post-grouting technology in precast piles. The specific technical difficulties that need to be overcome include the normal grouting technology at the pile tip and the grouting pipe connection technology, where the grouting pipe connection technology refers to:
[0008] Because prefabricated piles are not long enough, they usually need to be connected together when they are delivered on site; the connection method of the grouting pipe buried in the pile body at the pile connection is a technical key. If the connection joint of the grouting pipe is not handled properly, the grouting material will leak out at the joint during high-pressure grouting, resulting in insufficient grouting at the pile tip.
[0009] The production technology of precast solid piles has become quite mature after decades of practice. However, how to reasonably arrange the grouting pipes in the precast solid piles, how to ensure that the grouting material can be effectively sprayed to the pile tip through high pressure and ensure that the pile body does not leak, and how to reasonably arrange the construction sequence to ensure that the work at the pile joint can proceed smoothly is a blank area that needs further research.
[0010] Shortcomings of current technology:
[0011] Mature post-grouting technology is generally only applicable to bored cast-in-place piles. There are some post-grouting technologies for hollow precast piles, but there is a lack of mature post-grouting technology applicable to solid precast piles.
[0012] In view of the above problems, it is necessary to improve them. Utility Model Content
[0013] The utility model aims to provide an exposed connection joint for a grouting pipe at a prefabricated square pile connection point, which has a simple structure, an ingenious design and ensures the sealing of the grouting pipe connection point.
[0014] In order to achieve the above purpose, the technical solution adopted by the utility model is: an exposed connection joint of a grouting pipe at the joint of prefabricated square piles, comprising an upper prefabricated square pile and a lower prefabricated square pile arranged relatively to each other; a lower notch is formed on at least one side of the bottom of the upper prefabricated square pile, an upper grouting pipe is pre-embedded in the upper prefabricated square pile, the lower end of the upper grouting pipe extends into the lower notch, an upper notch is formed on at least one side of the top of the lower prefabricated square pile, a lower grouting pipe is pre-embedded in the lower prefabricated square pile, the upper end of the lower grouting pipe extends into the upper notch, the lower notch of the upper prefabricated square pile is connected correspondingly to the upper notch of the lower prefabricated square pile, and the lower end and the upper end are locked by installing a joint.
[0015] As a preferred solution of the utility model, the installation joint includes a connecting hose, and two ends of the connecting hose are respectively sleeved on the lower end and the upper end.
[0016] As a preferred solution of the utility model, the connecting hose is locked with the lower end and the upper end by metal buckles.
[0017] As a preferred solution of the utility model, the distance between the outer side of the upper grouting pipe and the outer end of the upper prefabricated square pile is 5mm-15mm, and the distance between the outer side of the lower grouting pipe and the outer end of the lower prefabricated square pile is 5mm-15mm.
[0018] As a preferred solution of the utility model, the distance between the pipe opening at the lower end and the end of the lower notch is 50 mm, and the distance between the pipe opening at the upper end and the end of the upper notch is 50 mm.
[0019] As a preferred solution of the present utility model, the height of the lower notch and the upper notch is 100 mm to 150 mm.
[0020] As a preferred solution of the utility model, the thickness of the lower notch and the upper notch is 20 mm to 30 mm greater than the diameter of the upper grouting pipe and the lower grouting pipe.
[0021] As a preferred solution of the utility model, the width of the lower notch and the upper notch is 20 mm to 30 mm larger than the diameter of the upper grouting pipe and the lower grouting pipe.
[0022] As a preferred solution of the utility model, the lower notch is located at the bottom center of one side of the upper prefabricated square pile, and the upper notch is located at the top center of one side of the lower prefabricated square pile.
[0023] As a preferred solution of the utility model, there are two lower notches, symmetrically arranged on both sides of the bottom center of the upper prefabricated square pile, and there are two upper notches, symmetrically arranged on both sides of the bottom center of the lower prefabricated square pile.
[0024] The beneficial effects of the utility model are:
[0025] 1. The utility model has a simple structure, and the sealing of the grouting pipe connection is ensured by locking the lower end and the upper end through the installation joint, and no leakage will occur under the high pressure of grouting;
[0026] 2. The utility model is cleverly designed. The grouting pipe is buried in the center of the side of the prefabricated solid square pile, and a 5 to 15 mm thick protective layer is reserved to protect the grouting pipe from deformation or damage during the pile pressing process;
[0027] 3. The lower notch of the upper prefabricated square pile of the utility model is aligned with the upper notch of the lower prefabricated square pile, providing a working space for manually connecting the grouting pipe. The notch also plays a role in protecting the exposed section of the grouting pipe during the pile pressing process;
[0028] 4. The utility model is easy to operate, does not take up too much workload of pile connection, and does not prolong the time of pile connection; at the same time, the solution is cheap and will not cause an increase in cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 This is a schematic diagram of the assembly of the upper prefabricated square pile and the upper grouting pipe of Example 1 of the utility model;
[0030] Figure 2 In the utility model embodiment 1 Figure 1 AA section view;
[0031] Figure 3 This is a schematic diagram of the assembly of the lower prefabricated square pile and the lower grouting pipe of Example 1 of the utility model;
[0032] Figure 4 It is a schematic diagram of assembling the upper prefabricated square piles and the lower prefabricated square piles of Example 1 of the utility model;
[0033] Figure 5 It is a top view of embodiment 2 of the utility model;
[0034] Explanation of the reference numerals: upper prefabricated square pile 1, lower prefabricated square pile 2, lower notch 3, upper notch 4, installation joint 5, upper grouting pipe 10, lower end 11, lower grouting pipe 20, upper end 21, connecting hose 50, metal buckle 51. DETAILED DESCRIPTION
[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0037] Embodiment 1:
[0038] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.
[0039] An exposed connection joint of a grouting pipe at a prefabricated square pile joint, comprising an upper prefabricated square pile 1 and a lower prefabricated square pile 2 arranged relatively to each other; a lower notch 3 is formed on at least one side of the bottom of the upper prefabricated square pile 1, an upper grouting pipe 10 is pre-buried in the upper prefabricated square pile 1, a lower end 11 of the upper grouting pipe 10 extends into the lower notch 3, an upper notch 4 is formed on at least one side of the top of the lower prefabricated square pile 2, a lower grouting pipe 20 is pre-buried in the lower prefabricated square pile 2 The upper end 21 of the lower grouting pipe 20 extends into the upper notch 4, the lower notch 3 of the upper prefabricated square pile 1 is connected correspondingly to the upper notch 4 of the lower prefabricated square pile 2, and the lower end 11 is locked with the upper end 21 by installing a joint 5; the lower notch of the upper prefabricated square pile of the utility model is aligned with the upper notch of the lower prefabricated square pile, which provides a working space for manually connecting the grouting pipe. The notch also plays a role in protecting the exposed section of the grouting pipe during the pile pressing process.
[0040] Specifically, the installation joint 5 includes a connecting hose 50 located in the lower slot 3 and the upper slot 4, and the two ends of the connecting hose 50 are respectively sleeved on the lower end 11 and the upper end 21, and the connecting hose 50 and the lower end 11 and the upper end 21 are locked by a metal buckle 51; the utility model has a simple structure, and the sealing of the grouting pipe connection is ensured by locking the installation joint between the lower end and the upper end, and no leakage will occur under the high pressure of grouting.
[0041] The distance between the outer side of the upper grouting pipe 10 and the outer end of the upper prefabricated square pile 1 is 5mm~15mm, and the distance between the outer side of the lower grouting pipe 20 and the outer end of the lower prefabricated square pile 2 is 5mm~15mm; specifically, in the present embodiment, the lower notch 3 is located at the bottom center position of one side of the upper prefabricated square pile 1, and the upper notch 4 is located at the top center position of one side of the lower prefabricated square pile 2; the distance between the outer side of the upper grouting pipe 10 and the outer end of the upper prefabricated square pile 1 is 10mm, and the distance between the outer side of the lower grouting pipe 20 and the outer end of the lower prefabricated square pile 2 is 10mm; the reserved 10mm protective layer thickness is to protect the upper grouting pipe 10 and the lower grouting pipe 20 from deformation or damage during the pile pressing process.
[0042] The distance between the pipe opening of the lower end portion 11 and the end portion of the lower notch 3 is 50 mm, and the distance between the pipe opening of the upper end portion 21 and the end portion of the upper notch 4 is 50 mm.
[0043] The height of the lower notch 3 and the upper notch 4 is 100 mm to 150 mm; specifically, in this embodiment, the height of the lower notch 3 and the upper notch 4 is 100 mm.
[0044] The thickness of the lower notch 3 and the upper notch 4 is 20 mm to 30 mm greater than the diameter of the upper grouting pipe 10 and the lower grouting pipe 20 ; specifically, in this embodiment, the thickness of the lower notch 3 and the upper notch 4 is 25 mm greater than the diameter of the upper grouting pipe 10 and the lower grouting pipe 20 .
[0045] The width of the lower notch 3 and the upper notch 4 is 20 mm to 30 mm larger than the diameter of the upper grouting pipe 10 and the lower grouting pipe 20 ; specifically, in this embodiment, the width of the lower notch 3 and the upper notch 4 is 25 mm larger than the diameter of the upper grouting pipe 10 and the lower grouting pipe 20 .
[0046] In this implementation, the construction steps of the connection joint on site are:
[0047] Step 1: The upper grouting pipe 10 and the lower notch 3 have been pre-buried in the upper prefabricated square pile 1 during the production process of the prefabricated pile factory; the lower grouting pipe 20 and the upper notch 4 have been pre-buried in the lower prefabricated square pile 2 during the production process of the prefabricated pile factory;
[0048] Step 2: Use a pile driver to drive the lower prefabricated square pile 2 into the soil to a designated position, with the pile end of the lower prefabricated square pile 2 exposed;
[0049] Step 3: Use a pile driver to hoist the upper prefabricated square pile 1 onto the lower prefabricated square pile 2, align the pile ends of the two piles and make close contact, and ensure that the lower notch 3 of the pile end is aligned with the upper notch 4; at this time, there is a gap of about 100 mm between the pipe openings of the upper grouting pipe 10 and the lower grouting pipe 20; weld or mechanically connect the piles;
[0050] Step 4: In the aligned lower notch 3 and upper notch 4, manually connect the upper grouting pipe 10 and the lower grouting pipe 20 using a connecting hose 50 and a metal buckle 51, and tighten the metal buckle to achieve a sealing effect;
[0051] Step 5: Continue piling, after driving the upper prefabricated square pile 1 into the soil, repeat steps 2 to 4;
[0052] Embodiment 2:
[0053] like Figure 5 As shown, Figure 5 It is a top view of embodiment 2 of the utility model;
[0054] Specifically, two lower notches 3 are provided, symmetrically arranged on both sides of the bottom center of the upper prefabricated square pile 1, and two upper notches 4 are provided, symmetrically arranged on both sides of the bottom center of the lower prefabricated square pile 2; wherein, two upper grouting pipes 10 located in the upper prefabricated square pile 1 are also provided, and two lower grouting pipes 20 located in the lower prefabricated square pile 2 are also provided. There are two installation joints 5 provided in this arrangement, and the above scheme is adopted, so that if one of the grouting pipes is blocked or leaked, the other can be used as a backup, thereby improving the safety of use.
[0055] For other contents of this embodiment, please refer to Embodiment 1.
[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
[0057] Although the present invention uses the following terms more often: upper prefabricated square pile 1, lower prefabricated square pile 2, lower notch 3, upper notch 4, installation joint 5, upper grouting pipe 10, lower end 11, lower grouting pipe 20, upper end 21, connecting hose 50, metal buckle 51, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.
Claims
1. An exposed connection joint of a grouting pipe at a prefabricated square pile joint, characterized in that: The invention comprises an upper prefabricated square pile (1) and a lower prefabricated square pile (2) arranged relatively to each other; a lower notch (3) is formed on at least one side of the bottom of the upper prefabricated square pile (1); an upper grouting pipe (10) is pre-buried in the upper prefabricated square pile (1); a lower end (11) of the upper grouting pipe (10) extends into the lower notch (3); an upper notch (4) is formed on at least one side of the top of the lower prefabricated square pile (2); a lower grouting pipe (20) is pre-buried in the lower prefabricated square pile (2); an upper end (21) of the lower grouting pipe (20) extends into the upper notch (4); the lower notch (3) of the upper prefabricated square pile (1) is connected to the upper notch (4) of the lower prefabricated square pile (2) in correspondence; the lower end (11) and the upper end (21) are locked by means of an installation joint (5).
2. The exposed connection joint of the grouting pipe at the connection point of the prefabricated square piles according to claim 1 is characterized by: The installation joint (5) comprises a connecting hose (50), and two ends of the connecting hose (50) are respectively sleeved on the lower end (11) and the upper end (21).
3. The exposed connection joint of the grouting pipe at the prefabricated square pile connection according to claim 2 is characterized by: The connecting hose (50) is locked with the lower end (11) and the upper end (21) via metal buckles (51).
4. The exposed connection joint of the grouting pipe at the prefabricated square pile connection according to claim 1 is characterized by: The distance between the outer side of the upper grouting pipe (10) and the outer end of the upper prefabricated square pile (1) is 5 mm to 15 mm, and the distance between the outer side of the lower grouting pipe (20) and the outer end of the lower prefabricated square pile (2) is 5 mm to 15 mm.
5. The exposed connection joint of the grouting pipe at the connection point of the prefabricated square piles according to claim 1 is characterized by: The distance between the pipe opening of the lower end (11) and the end of the lower notch (3) is 50 mm, and the distance between the pipe opening of the upper end (21) and the end of the upper notch (4) is 50 mm.
6. The exposed connection joint of the grouting pipe at the prefabricated square pile connection according to claim 1, characterized in that: The heights of the lower notch (3) and the upper notch (4) are 100 mm to 150 mm.
7. The exposed connection joint of the grouting pipe at the connection point of the prefabricated square piles according to claim 1 is characterized by: The thickness of the lower notch (3) and the upper notch (4) is 20 mm to 30 mm greater than the diameter of the upper grouting pipe (10) and the lower grouting pipe (20).
8. The exposed connection joint of the grouting pipe at the connection point of the prefabricated square piles according to claim 1 is characterized by: The width of the lower notch (3) and the upper notch (4) is 20 mm to 30 mm greater than the diameter of the upper grouting pipe (10) and the lower grouting pipe (20).
9. The exposed connection joint of the grouting pipe at the connection point of the prefabricated square piles according to claim 1, characterized in that: The lower notch (3) is located at the bottom center of one side of the upper prefabricated square pile (1), and the upper notch (4) is located at the top center of one side of the lower prefabricated square pile (2).
10. The exposed connection joint of the grouting pipe at the prefabricated square pile connection according to claim 1, characterized in that: There are two lower notches (3) symmetrically arranged on both sides of the bottom center of the upper prefabricated square pile (1), and there are two upper notches (4) symmetrically arranged on both sides of the bottom center of the lower prefabricated square pile (2).