CN111622271A

CN111622271A - Uplift-resistant pile cap

Info

Publication number: CN111622271A
Application number: CN202010354599.4A
Authority: CN
Inventors: 胡传鹏; 张世浪
Original assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Current assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-09-04
Anticipated expiration: 2040-04-28
Also published as: CN111622271B

Abstract

The invention relates to an uplift pile cap which comprises a cylinder body and a piston, wherein a cavity is arranged in the cylinder body, the piston comprises an upper end plate, a lower end plate and a stroke rod, the upper end plate is arranged in the cylinder body and can move along the axial direction of the cylinder body, and the lower end plate is arranged outside the cylinder body and is connected with the upper end plate through the stroke rod. The uplift pile cap provided by the invention distinguishes two stress states of tension and compression of the pile body, so that the pile body can be withdrawn from working when being compressed, does not participate in structural stress, and can effectively play a role only when resisting floating tension. The design effectively reduces the number of the pile bodies, greatly reduces the construction cost and has remarkable economic benefit.

Description

Uplift-resistant pile cap

Technical Field

The invention relates to the technical field of anti-floating design of underground constructions, in particular to an anti-pulling pile cap.

Background

With the rapid development of cities, more and more people gather in cities, and many ultra-large water works and sewage treatment plant projects are landed in order to meet the water consumption and drainage requirements of the rapidly increasing population. The common characteristic of the projects is that a plurality of ultra-large water ponds need to be built, such as a clean water pond in a water works, a folded plate flocculation horizontal sedimentation pond, a secondary sedimentation pond in a sewage treatment plant, a biological reaction pond and the like. The requirement of the pond on the bearing capacity of the foundation is not high, the original soil layer of the excavation site can meet the bearing capacity requirement, however, the buried depth of the pond is deep, the size of the pond is large, and when the underground water level is high, the dead weight of the pond can not meet the requirement of the anti-floating design.

In the prior art, the uplift pile body is adopted for resisting floating mostly, but the bearing capacity of the base bearing layer completely meets the design requirement, and the self weight of the structure of the pool cannot meet the requirement of resisting floating due to the fact that the underground water level is high, and the embarrassment can exist when the uplift pile is adopted for resisting floating. The combination of pressing and pulling of the pile body is considered, the contribution of the bearing capacity of the base bearing layer is completely ignored, and great waste can be caused by arranging excessive pile bodies; considering the bearing capacity of the base bearing layer, only a small amount of pile bodies are used for resisting buoyancy, the ideal effect of directly transmitting the pressure of the pool bottom plate to the foundation soil cannot be achieved by adopting the current uplift pile cap design and construction mode, the pressure of the pool bottom plate is preferentially transmitted to the pile bodies, and the pile bodies can be even damaged by pressure in severe cases.

The key of the problems is how to ensure that the pile body only used for resisting the floating can be withdrawn from the work when being pressed, does not participate in the structural stress, and can effectively play a role when resisting the floating and being pulled.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a uplift pile cap, which can distinguish two stressed states of a pressed pile body and a pulled pile body, can maximally utilize a foundation bearing layer, reduce the number of pile bodies, and effectively reduce the construction cost.

Based on this, the present invention provides an uplift pile cap, comprising:

the cylinder body is internally provided with a cavity, and a through hole communicated with the cavity is formed in a bottom plate of the cylinder body;

the piston, the piston includes upper end plate, lower end plate and stroke pole, the upper end plate is located can follow in the cavity the axial motion of cylinder body, the upper end plate with cylinder body clearance fit, the lower end plate is located outside the cavity and being located the below of cylinder body, the stroke pole is worn to locate in the through-hole and will the upper end plate with the lower end plate is connected.

Preferably, the chamber is cylindrical and the upper end plate is cylindrical.

Preferably, the height of the cylinder body is 50-60 mm.

Preferably, the length of the stroke rod is 20-30 mm.

Preferably, the top edge of the cylinder body is provided with a shear wing ring, and a stiffening rib is connected between the shear wing ring and the side wall of the cylinder body.

Preferably, the cylinder and the piston are made of metal materials.

Preferably, the surfaces of the cylinder and the piston are coated with an anticorrosive material.

Compared with the prior art, the uplift pile cap provided by the embodiment of the invention has the beneficial effects that:

the uplift pile cap provided by the invention comprises a cylinder body and a piston, wherein a cavity is arranged in the cylinder body, the piston comprises an upper end plate, a lower end plate and a stroke rod, the upper end plate is arranged in the cylinder body and can move along the axial direction of the cylinder body, and the lower end plate is arranged outside the cylinder body and is connected with the upper end plate through the stroke rod. When the device is applied, when the dead weight of the water pool is greater than the buoyancy force applied to the water pool, the water pool sinks, the cylinder body is pressed to slide downwards, and based on the maximum stroke of the stroke rod and the height of the cylinder body, when the deformation of the foundation does not exceed the height of the cylinder body and the maximum stroke of the stroke rod, the upper end plate is always positioned in the cavity and is not contacted with the top plate of the cylinder body, and the lower end plate is always positioned outside the cavity and is not contacted with the bottom plate of the cylinder body, so that only the cylinder body and the foundation soil are subjected to the pressure of the water pool in the whole sinking process of the; when the dead weight of the water pool is smaller than the buoyancy of the water pool, the water pool floats upwards, the cylinder body is pulled to slide upwards, when the floating displacement of the water pool exceeds the maximum early-stage sinking displacement, the bottom plate of the cylinder body is in contact with the upper end plate and transmits the pulling force to the piston, the piston transmits the pulling force to the pile body, and the pile body is subjected to the pulling force to participate in the work, so that the tensile anti-floating effect is exerted. Based on the above, the uplift pile cap distinguishes two stress states of the pile body in tension and compression, so that the pile body can quit working when being compressed, does not participate in structural stress, and can effectively play a role only when resisting floating and tension. The design effectively reduces the number of the pile bodies, greatly reduces the construction cost and has remarkable economic benefit.

Drawings

Fig. 1 is a schematic structural view of an uplift pile cap according to an embodiment of the invention;

fig. 2 is a top view of a uplift pile cap according to an embodiment of the invention.

In the figure: 1. a cylinder body; 11. a chamber; 12. a through hole; 2. a piston; 21. an upper end plate; 22. a lower end plate; 23. a trip lever; 3. a pile body; 31. an end plate; 4. a shear wing ring; 5. a stiffening rib.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and "second" information may also be referred to as "first" information without departing from the scope of the present invention.

As shown in fig. 1 and 2, the invention provides an uplift pile cap, which is arranged on a pile body 3 and comprises a cylinder body 1 and a piston 2, wherein a chamber 11 is arranged inside the cylinder body 1, a through hole 12 communicated with the chamber 11 is arranged on a bottom plate of the cylinder body 1, the piston 2 comprises an upper end plate 21 arranged inside the cylinder body 1, a lower end plate 22 arranged outside the cylinder body 1 and a stroke rod 23, the lower end plate 22 is welded with an end plate 31, the stroke rod 23 is arranged in the through hole 12 in a penetrating way and fixedly connects the upper end plate 21 with the lower end plate 22, and the upper end plate 21 is in clearance fit with the cylinder body 1 and can do linear motion along the axial direction of the cylinder body 1.

Based on the structure, when the uplift pile cap is used, when the self weight of the water pool is larger than the buoyancy force applied to the water pool, the water pool sinks, the cylinder body 1 is pressed to slide downwards, and based on the maximum stroke of the stroke rod 23 and the height of the cylinder body 1, when the deformation of the foundation does not exceed the height of the cylinder body 1 and the maximum stroke of the stroke rod 23, the upper end plate 21 is always positioned in the cavity 11 and is not contacted with the top plate of the cylinder body 1, and the lower end plate 22 is always positioned outside the cavity 11 and is not contacted with the bottom plate of the cylinder body, so that only the cylinder body 1 and foundation soil are subjected to the pressure of the water pool in the whole sinking process of the water pool, and; when the dead weight of the pool is smaller than the buoyancy of the pool, the pool floats upwards, the cylinder body 1 is pulled to slide upwards, when the floating displacement of the pool exceeds the maximum early-stage sinking displacement, the bottom plate of the cylinder body 1 is in contact with the upper end plate 21 and transmits the pulling force to the piston, the piston transmits the pulling force to the pile body, the pile body is subjected to the pulling force to participate in the work, and the tensile anti-floating effect is exerted. Based on this, this resistance to plucking pile cap draws pressure two kinds of atress states to distinguish the pile body 3 for pile body 3 can withdraw from work when the pressure, does not participate in the structural stress, and only can effectively play a role when anti floating is drawn. The design effectively reduces the number of the pile bodies 3, greatly reduces the construction cost and has remarkable economic benefit.

Further, in order to ensure that the upper end plate 21 can slide smoothly in the chamber 11, the chamber 11 is formed in a cylindrical shape, and the upper end plate 21 is also formed in a cylindrical shape matching the chamber 11.

Alternatively, as a specific embodiment of the uplift pile cap provided in the present invention, the height of the cylinder body 1 is set to 50-60 mm in consideration of the settlement of the sump, and the length of the stroke rod 23 is set to 20-30 mm in consideration of the thickness of the upper end plate 21. In the present embodiment, the height of the cylinder 1 is preferably 50mm, and the length of the stroke rod 23 is preferably 20 mm.

Optionally, as a specific embodiment of the uplift pile cap provided by the present invention, a shear wing ring 4 is provided at the top edge of the cylinder body 1, and a stiffening rib 5 is connected between the shear wing ring 4 and the side wall of the cylinder body 1. The arrangement of the shear wing rings 4 and the stiffening ribs 5 further improves the connecting force between the uplift pile caps and the pool, ensures that the uplift pile caps can play a stable role, and certainly, the width of the shear wing rings 4 and the number of the stiffening ribs 5 can be calculated and determined according to the uplift bearing capacity of a single pile.

Specifically, in the embodiment of the present invention, in order to ensure the normal use of the uplift pile cap, the cylinder block 1, the shear wing ring 4 and the stiffening ribs 5 are cast in the bottom plate of the underground water pool.

Optionally, as a specific embodiment of the uplift pile cap provided by the present invention, the surfaces of the cylinder 1 and the piston 2 are coated with an anticorrosive material. So, anticorrosive material can effectively prevent groundwater corruption piston 2 and pile body, and of course, constructor also can rationally supply other anticorrosive measures to the corrosive effects of steel construction according to the foundation soil and water on scene to guarantee that this resistance to plucking pile cap can normally work in design service life.

In addition, the cylinder body 1 and the piston 2 are preferably made of metal materials, and the raw materials are common, so that the production cost is reduced.

In summary, the uplift pile cap provided by the embodiment of the invention is provided with the cylinder and the piston, and the two stress states of the pile body under compression and tension are distinguished, so that the foundation bearing layer can be utilized to the maximum extent, the arrangement of the pile body is reduced, and the construction cost is effectively reduced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An uplift pile cap, comprising:

2. The uplift pile cap according to claim 1, wherein the chamber is provided with a cylindrical shape and the upper end plate is also provided with a cylindrical shape.

3. The uplift pile cap according to claim 1, wherein the height of the cylinder body is 50-60 mm.

4. The uplift pile cap according to claim 3, wherein the length of the stroke rod is 20-30 mm.

5. The uplift pile cap according to claim 1, wherein the top edge of the cylinder body is provided with a shear wing ring, and a stiffening rib is connected between the shear wing ring and the side wall of the cylinder body.

6. The uplift pile cap according to claim 1, wherein the cylinder and the piston are made of a metal material.

7. The uplift pile cap according to claim 1, wherein surfaces of the cylinder and the piston are coated with an anti-corrosive material.