Prefabricated pipe pile cast-in-place hanging plate formwork reinforcing device, supporting structure and construction method

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to a prefabricated pipe pile cast-in-place hanging plate formwork reinforcing device, a supporting structure and a construction method. The reinforcing device comprises a row of prefabricated pipe piles, and formworks are arranged on the same sides of the row of prefabricated pipe piles. The construction method is characterized in that vertical tie bars are arranged between the prefabricated pipe piles, fixing assemblies are arranged at the ends, located on the formwork, of the vertical tie bars, and the fixing assemblies are used for limiting the outer surface of the formwork; the other end, far away from the template, of the vertical tie bar goes deep into soil; a transverse tie bar is arranged on the other side, provided with the formwork, of the prefabricated pipe pile, and the transverse tie bar is connected with the vertical tie bar. The problem that the prefabricated pipe piles are pulled and damaged due to the fact that the prefabricated pipe piles are connected through steel bars is solved, the pouring quality is guaranteed, and the stability of a supporting structure is improved. In addition, the vertical tie bars can be detached for recycling, and cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, and in particular to a prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, a support structure and a construction method. Background Art

[0002] Foundation pit support is a measure of support, reinforcement and protection for the side walls and surrounding environment to ensure the safety of underground structure construction and the environment around the foundation pit. The selection and design of the support structure usually depends on many factors such as the depth of the foundation pit, geological conditions, surrounding environment and project duration. Common foundation pit support methods include: slope excavation, soil nail wall, pile support, underground continuous wall, cement soil pile wall, etc. Among them, pile support usually consists of support piles, supports (or soil anchors) and anti-seepage curtains. In some projects, hanging plates are used as anti-seepage curtains to form hanging plate support structures. Hanging plate support structure is a common deep foundation pit support structure. It is a technology that suspends multiple hanging plates on the foundation pit wall through pipe piles pre-set in the foundation pit to improve the stability and safety of the foundation pit wall.

[0003] Prior art CN111236264A discloses a recyclable and reusable assembled deep foundation pit support structure, including prefabricated pipe piles, hangers and hanging plates; nuts with internal threads are pre-embedded on the prefabricated pipe piles; the hangers include a first connection frame, a second connection frame and a connection plate for connecting to the prefabricated pipe piles; the second connection frame can be sleeved in the first connection frame, and a positioning device is provided between the first connection frame and the second connection frame; the connection plate is provided on the second connection frame, and a connecting bolt is fixed on the connection plate. The support structure uses prefabricated pipe piles with a smooth surface and prefabricated threaded holes for installing hangers. After being driven into the ground, hangers and hanging plates can be installed. After use, the hanging plates and hangers can be disassembled for recycling. The prefabricated pipe piles can be pulled out by a pile puller, and the prefabricated pipe piles can also be recycled; so as to reduce environmental pollution and reduce construction costs.

[0004] However, the above-mentioned support structure uses prefabricated hanging plates, which cannot meet the use requirements in projects with relatively high strength requirements, and cast-in-place hanging plates are still required. If cast-in-place hanging plates are used, formwork is required. The fixation and stability of the formwork affect the subsequent casting quality of the hanging plates. In the prior art, the formwork is usually fixed by connecting it with prefabricated pipe piles using steel bars, and then the formwork is fixed by the steel bars. However, in this way, during the casting process, the formwork is subjected to the outward force of the pouring concrete, and the steel bars are pulled, which can easily lead to the damage of the prefabricated pipe piles, or the outward movement of the formwork, thereby affecting the casting quality and even the stability of the support structure.

[0005] In summary, there is an urgent need to provide a prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, support structure, and construction method to stabilize and reinforce the formwork without damaging the prefabricated pipe piles. Summary of the invention

[0006] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, a supporting structure and a construction method.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] In a first aspect, the present invention provides a prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, comprising a row of prefabricated pipe piles, a formwork is arranged on the same side of the row of prefabricated pipe piles; vertical tie bars are arranged between the prefabricated pipe piles, a fixing assembly is arranged at one end of the formwork, and the fixing assembly is used for limiting the outer surface of the formwork; the other end of the vertical tie bar away from the formwork is deeply embedded in the soil;

[0009] The other side of the template for setting the prefabricated pipe piles is provided with transverse reinforcements, and the transverse reinforcements are connected with the vertical reinforcements.

[0010] Furthermore, a hook is provided at the end of the vertical tie rod, and the transverse tie rod is passed through the hook.

[0011] Furthermore, each vertical tie bar is connected to a section of transverse tie bars, and there is a gap between adjacent transverse tie bars.

[0012] Furthermore, the vertical tension bars and the transverse tension bars are both round steels with a diameter of 12-20 mm.

[0013] Furthermore, the diameter D1 of the vertical reinforcement is determined by:

[0014]

[0015] In the above formula, d represents the depth of the vertical reinforcement into the soil, unit is mm; H is the height index; D2 is the diameter of the transverse reinforcement connected to the vertical reinforcement, unit is mm; a is the correction constant.

[0016] Furthermore, the correction constant a ranges from 0.04 to 0.05.

[0017] Furthermore, the distance S between the vertical reinforcement and the bottom of the precast position of the hanging plate is obtained, in meters;

[0018] If S < 5, the height index H is between 1 and 1.1;

[0019] If 5≤S<10, the value of the height index H is 1.1 to 1.35;

[0020] If S ≥ 10, the value of the height index H is 1.35 to 1.5.

[0021] Furthermore, the diameter D2 of the transverse reinforcement is determined as follows:

[0022]

[0023] In the above formula, b is the correction constant, W is the set thickness of the hanging plate, unit is mm; S is the pile spacing, unit is mm; D3 is the diameter of the prefabricated pipe pile, unit is mm.

[0024] Furthermore, the correction coefficient b is set to a value of 0.3-0.5.

[0025] Furthermore, a drainage pipe is arranged between the prefabricated pipe piles, and the vertical reinforcement is arranged inside the drainage pipe.

[0026] Furthermore, a notch is provided at one end of the drainage pipe away from the template, the extension direction of the notch is the same as the length direction of the vertical reinforcement, and the transverse reinforcement is provided through the notch.

[0027] Furthermore, the fixing assembly includes a locking plate, a locking nut, a transverse steel pipe and a vertical steel pipe, the locking plate is passed through the vertical tensioning rod, and the locking nut is arranged on the outside of the locking plate; the transverse steel pipe is arranged on the inside of the locking plate, and the vertical steel pipe is arranged on the inside of the transverse steel pipe; the vertical steel pipe is used to limit the outer surface of the formwork.

[0028] Furthermore, the upper and lower ends of the locking plate are bent toward the template direction, and the number of the transverse steel tubes is 2, one of the transverse steel tubes is arranged in the internal space after the upper end of the locking plate is bent; the other transverse steel tube is arranged in the internal space after the lower end of the locking plate is bent.

[0029] In a second aspect, the present invention also provides a construction method for the above-mentioned prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, comprising:

[0030] S1. Dig holes between prefabricated pipe piles and install transverse reinforcements;

[0031] S2. Install the drainage pipe with slots according to the position of the horizontal reinforcement and install the vertical reinforcement at the same time;

[0032] S3. Backfill soil at the hole and install the hanging plate reinforcement;

[0033] S4. Install fixing components and templates.

[0034] In a third aspect, the present invention further provides a construction method of a support structure, comprising:

[0035] Step 1: Driving prefabricated pipe piles;

[0036] Step 2: Install the hanging plate reinforcement;

[0037] Step 3, installing the formwork; during the process of installing the formwork, the formwork is reinforced using the above-mentioned prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device, and the formwork is installed using the above-mentioned prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device construction method;

[0038] Step 4: Pour to form a support structure.

[0039] In a fourth aspect, the present invention further provides a support structure, which is constructed using the above-mentioned support structure construction method, and includes prefabricated pipe piles and hanging plates, wherein the hanging plates form a concrete structure with the prefabricated pipe piles through a casting process.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device provided by the present invention has a vertical tie bar on one side of the prefabricated pipe pile, and one end of the vertical tie bar is deeply embedded in the soil and fixed in the soil by a transverse tie bar, and the other end uses a fixing component to limit the outer surface of the formwork, so that the force applied to the formwork during pouring is transmitted to the soil by means of the vertical tie bar. Compared with the prior art, the problem of tensile damage to the prefabricated pipe piles caused by connecting the prefabricated pipe piles with steel bars is avoided. In addition, the soil can buffer the force transmitted by the vertical tie bar, greatly reducing the outward displacement of the formwork during pouring, ensuring the pouring quality, and improving the stability of the support structure.

[0042] The present invention also arranges vertical tie bars in the drainage pipe. During pouring, the vertical tie bars are not poured into the supporting structure. When the formwork is disassembled, the vertical tie bars can be removed and recycled, saving costs. At the same time, the drainage pipe can be fixed by using the vertical tie bars and the horizontal tie bars, ensuring the service life of the drainage pipe and the drainage effect of the supporting structure in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A top view of the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device provided by the present invention.

[0044] Figure 2 This is a front view of the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device provided by the present invention.

[0045] Figure 3 This is a right view of the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device provided by the present invention.

[0046] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0047] Description of reference numerals:

[0048] 1. Prefabricated pipe piles; 2. Formwork; 3. Vertical reinforcement; 4. Foundation pit soil; 5. Horizontal reinforcement; 6. Drain pipe; 7. Locking plate; 8. Locking nut; 9. Horizontal steel pipe; 10. Vertical steel pipe; 11. Hanging plate reinforcement. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the protection scope of the present invention.

[0050] It should be noted that, unless otherwise specifically stated, the relative arrangements of components and steps, and numerical expressions set forth in these embodiments should not be construed as limiting the scope of the present invention.

[0051] The following description of the exemplary embodiments is merely illustrative and is not intended to limit the present invention and its application or use in any sense. Techniques, methods and devices known to ordinary technicians in the relevant field may not be discussed in detail here, but where applicable, these techniques, methods and devices should be considered as part of this specification.

[0052] Embodiment 1

[0053] This embodiment provides a prefabricated pipe pile cast-in-place hanging plate template reinforcement device, such as Figure 1 As shown, it comprises a row of prefabricated pipe piles 1, and a template 2 is set on the same side of the row of prefabricated pipe piles 1; vertical tie bars 3 are set between the piles of the prefabricated pipe piles 1, and a fixing assembly is set at one end of the vertical tie bars 3 to limit the outer surface of the template 2; the other end of the vertical tie bars 3 away from the template 2 is deeply embedded in the soil; that is, deeply embedded in the soil Figure 1 In the foundation pit soil 4 shown.

[0054] The other side of the prefabricated pipe pile 1 where the template 2 is provided is provided with a transverse reinforcement 5 , and the transverse reinforcement 5 is connected to the vertical reinforcement 3 .

[0055] like Figure 3 and Figure 4 As shown, a hook is provided at the end of the vertical reinforcement 3, and the transverse reinforcement 5 is inserted into the hook. The hook can be used to fix the vertical reinforcement 3, so that the force borne by the template 2 can be transmitted to the transverse reinforcement 5 through the vertical reinforcement 3, and then transmitted to the soil, which is also conducive to disassembly of the vertical reinforcement 3 and realizes the recycling of the reinforcement.

[0056] like Figure 1As shown, each vertical tie bar 3 is connected to a section of transverse tie bars 5, and there is a gap between adjacent transverse tie bars 5. That is, the transverse tie bars 5 connected to each vertical tie bar 3 are independently buried in the foundation pit soil, rather than using one tie bar to penetrate a row of vertical tie bars 3. This is because the foundation pit soil where each vertical tie bar 3 is located is not on the same plane. Considering the structural strength of the reinforcement device, independently setting the transverse tie bars 5 can provide better structural stability; on the other hand, the position of the transverse tie bars 5 can also be independently adjusted to optimize the final structural strength.

[0057] Wherein, the vertical tie bars 3 and the transverse tie bars 5 are both round steels with a diameter of 12-20 mm.

[0058] Preferably, the diameter D1 of the vertical reinforcement 3 is determined by:

[0059]

[0060] In the above formula, d represents the depth of the vertical reinforcement 3 into the soil, in mm; H is the height index; D2 is the diameter of the transverse reinforcement 5 connected to the vertical reinforcement 3, in mm; a is the correction constant. The correction constant a ranges from 0.04 to 0.05.

[0061] The method for determining the height index H is:

[0062] Get the distance S between the vertical reinforcement 3 and the bottom of the precast position of the hanging plate, in meters;

[0063] If S < 5, the height index H is between 1 and 1.1;

[0064] If 5≤S<10, the value of the height index H is 1.1 to 1.35;

[0065] If S ≥ 10, the value of the height index H is 1.35 to 1.5.

[0066] According to the different positions of the vertical reinforcements 3 and the different depths of the vertical reinforcements 3 in the soil, vertical reinforcements 3 of different diameters are designed to reduce the use cost of the vertical reinforcements 3 while ensuring the structural strength.

[0067] The diameter D2 of the transverse reinforcement 5 is determined as follows:

[0068]

[0069] In the above formula, b is the correction constant, and the correction coefficient b is 0.3-0.5; W is the set thickness of the hanging plate, in mm; S is the pile spacing, in mm; D3 is the diameter of the prefabricated pipe pile, in mm.

[0070] The pile spacing S is the minimum distance between the outer surfaces of adjacent prefabricated pipe piles.

[0071] The length of each section of transverse reinforcement 5 is determined according to the pile spacing, at least to ensure that the transverse reinforcement 5 does not interfere with adjacent transverse reinforcement 5 during the fine-tuning process; and is greater than the pile spacing.

[0072] like Figure 3 and Figure 4 As shown, a drainage pipe 6 is also arranged between the prefabricated pipe piles 1, and the vertical reinforcement 3 is arranged inside the drainage pipe 6. A notch is arranged at one end of the drainage pipe 6 away from the template 2, and the extension direction of the notch is the same as the length direction of the vertical reinforcement 3, and the transverse reinforcement 5 is arranged through the notch.

[0073] After the transverse reinforcement 5 is fixed, the drainage pipe 6 is fixed to the outer periphery of the vertical reinforcement 3. In the pouring process, the drainage pipe 6 is not easy to be displaced, ensuring the smooth drainage of the later support structure. The drainage pipe 6 can be fixed to the vertical reinforcement by filling the drainage pipe with wood blocks or the like.

[0074] like Figure 2 and Figure 4 As shown, the fixing assembly includes a locking plate 7, a locking nut 8, a transverse steel pipe 9 and a vertical steel pipe 10. The locking plate 7 is passed through the vertical tensioning bar 3, and the locking nut 8 is arranged on the outside of the locking plate 7; the transverse steel pipe 9 is arranged on the inside of the locking plate 7, and the vertical steel pipe 10 is arranged on the inside of the transverse steel pipe 9; the vertical steel pipe 10 is used to limit the outer surface of the template 2.

[0075] The upper and lower ends of the locking plate 7 are bent toward the template 2. The number of the transverse steel tubes 9 is 2. One transverse steel tube 9 is arranged in the internal space after the upper end of the locking plate 7 is bent; the other transverse steel tube 9 is arranged in the internal space after the lower end of the locking plate 7 is bent.

[0076] A circular transverse steel tube 9 is used to contact a circular vertical steel tube 10. The vertical steel tube 10 is used to limit the outer surface of the template 2. The transverse steel tube 9 is then fixed using a locking plate 7 and a locking nut 8 to reduce friction and damage to the outer surface of the template 2. The recycled template 2 can be reused to avoid material waste.

[0077] Embodiment 2

[0078] This embodiment provides a construction method for constructing the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device provided in the first embodiment, comprising:

[0079] S1, digging holes between the prefabricated pipe piles 1 and installing transverse reinforcement 5;

[0080] S2. Install the drainage pipe 6 with a notch according to the position of the transverse reinforcement 5. The drainage pipe 6 is a PVC pipe. At the same time, install the vertical reinforcement 3.

[0081] S3. Backfill the hole with clay and install the hanging plate steel bars; backfill the clay so that the end of the drainage pipe 6 is wrapped with clay, and then during the pouring process, the drainage pipe 6 is not easy to penetrate into the concrete, thereby ensuring the drainage performance of the drainage pipe 6.

[0082] S4. Install and fix components and template 2.

[0083] Embodiment 3

[0084] This embodiment provides a construction method of a support structure, including:

[0085] Step 1: driving prefabricated pipe pile 1;

[0086] Step 2: Install the hanging plate reinforcement;

[0087] Step 3, installing the template 2; during the installation of the template 2, the template is reinforced using the prefabricated pipe pile cast-in-place hanging plate template reinforcement device provided in Example 1, and the template is installed using the construction method of the prefabricated pipe pile cast-in-place hanging plate template reinforcement device provided in Example 2;

[0088] Step 4: Pour to form a support structure.

[0089] After the support structure is poured, the prefabricated pipe pile cast-in-place hanging plate template reinforcement device is removed. First, the locking plate 7 and the locking nut 8 are removed, and then the horizontal steel pipe 9 and the vertical steel pipe 10 are removed, and then the template 2 can be easily removed. After removing the template 2, the vertical tie rod 3 is pulled out from the drainage pipe 6, and the horizontal tie rod 5 is left in the soil. The vertical tie rod 3, the template 2 and the fixing components can be recycled and reused to reduce construction costs.

[0090] Embodiment 4

[0091] This embodiment provides a support structure, which is constructed using the construction method of the support structure provided in Embodiment 3, and includes prefabricated pipe piles and hanging plates. The hanging plates form a concrete structure with the prefabricated pipe piles through a casting process.

[0092] The above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, a person skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A prefabricated pipe pile cast-in-place hanging plate template reinforcement device, comprising a row of prefabricated pipe piles, and a template is arranged on the same side of the row of prefabricated pipe piles; characterized in that: Vertical reinforcement bars are arranged between the prefabricated pipe piles. A fixing assembly is arranged at one end of the template, and the fixing assembly is used to limit the outer surface of the template. The other end of the vertical reinforcement bar away from the template is deeply embedded in the soil. The other side of the template for setting the prefabricated pipe piles is provided with transverse reinforcements, and the transverse reinforcements are connected with the vertical reinforcements.

2. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 1 is characterized in that: The ends of the vertical reinforcing bars are provided with hooks, and the transverse reinforcing bars are passed through the hooks.

3. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 1 is characterized in that: Each vertical tie bar is connected to a section of transverse tie bars, and there is a gap between adjacent transverse tie bars; The vertical and transverse reinforcements are both round steels with a diameter of 12-20 mm.

4. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 3 is characterized in that: The diameter D1 of the vertical reinforcement is determined as follows: In the above formula, d represents the depth of the vertical reinforcement into the soil, in mm; H is the height index; D2 is the diameter of the transverse reinforcement connected to the vertical reinforcement, in mm; a is the correction constant; Get the distance S between the vertical reinforcement and the bottom of the precast position of the hanging plate, in meters; If S < 5, the height index H is between 1 and 1.1; If 5≤S<10, the value of the height index H is 1.1 to 1.35; If S ≥ 10, the value of the height index H is 1.35 to 1.

5.

5. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 4 is characterized in that: The diameter D2 of the transverse reinforcement is determined as follows: In the above formula, b is the correction constant, W is the set thickness of the hanging plate, unit is mm; S is the pile spacing, unit is mm; D3 is the diameter of the prefabricated pipe pile, unit is mm.

6. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 1 is characterized in that: Drainage pipes are also arranged between the prefabricated pipe piles, and the vertical reinforcement bars are arranged inside the drainage pipes; A notch is arranged at one end of the drainage pipe away from the template, the extension direction of the notch is the same as the length direction of the vertical reinforcement, and the transverse reinforcement is arranged through the notch.

7. The prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to claim 1 is characterized in that: The fixing assembly includes a locking piece, a locking nut, a transverse steel pipe and a vertical steel pipe. The locking piece is inserted into the vertical tie bar, and the locking nut is arranged on the outside of the locking piece; the transverse steel pipe is arranged on the inside of the locking piece, and the vertical steel pipe is arranged on the inside of the transverse steel pipe; the vertical steel pipe is used for limiting the outer surface of the template; The upper and lower ends of the locking plate are bent toward the template direction. The number of the transverse steel pipes is 2, one of which is arranged in the internal space after the upper end of the locking plate is bent; the other transverse steel pipe is arranged in the internal space after the lower end of the locking plate is bent.

8. The construction method of the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device according to any one of claims 1 to 7, characterized in that: include: S1. Dig holes between prefabricated pipe piles and install transverse reinforcements; S2. Install the drainage pipe with slots according to the position of the horizontal reinforcement and install the vertical reinforcement at the same time; S3. Backfill soil at the hole and install the hanging plate reinforcement; S4. Install fixing components and templates.

9. A construction method of a support structure, characterized in that: include: Step 1: Driving prefabricated pipe piles; Step 2: Install the hanging plate reinforcement; Step 3: Install the template; During the installation of the formwork, the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device described in any one of claims 1 to 7 is used to reinforce the formwork, and the formwork is installed using the construction method of the prefabricated pipe pile cast-in-place hanging plate formwork reinforcement device described in claim 8; Step 4: Pour to form a support structure.

10. A support structure, characterized in that: The construction method of the support structure according to claim 9 is used for construction, comprising prefabricated pipe piles and hanging plates, wherein the hanging plates are formed into a concrete structure with the prefabricated pipe piles through a casting process.

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