Force bearing device for installing expansion block at pile bottom and pile provided with expansion block
By installing the load bearing device of the expansion block at the bottom of the pile, the expansion block absorbs the moisture volume of the soil layer and expands and squeezes the soil, the problem of insufficient bearing capacity of low permeability soil in the existing technology is solved, and the bearing capacity of the pile is improved and Cost reduction.
Patent Information
- Application Number
- CN202323559705.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-12-26
AI Technical Summary
When the prior art improves the bearing capacity of the soil at the end of the pile, the effect on low permeability clay soil is poor. Mechanical extrusion cannot achieve soil consolidation, and the pressure grouting slurry flows unevenly, so it cannot effectively improve the bearing capacity of the pile. .
The load bearing device of the expansion block is installed at the bottom of the pile. The expansion block absorbs the moisture content of the soil layer and expands and squeezes the soil body to improve the bearing capacity. The device protects the expansion block through the support and permeable pore structure to ensure that the water enters and expands.
Effectively improve the bearing capacity of pile end soil and reduce settlement, it is suitable for low permeability soil, avoiding the high cost of traditional methods and complex technical problems.
Smart Images
Figure CN222314055U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pile foundation engineering, and relates to a load-bearing device for installing an expansion block at the bottom of a pile and a pile equipped with the expansion block. Background Art
[0002] Improving the bearing capacity of the soil at the pile end is an effective way to improve the bearing capacity of the pile. In particular, when the pile end falls on the shallow bearing layer, the bearing capacity of the pile is slightly insufficient, and the next bearing layer is separated from it by a thick soft soil layer, if the soil at the pile end of the shallow bearing layer can be modified to improve its bearing capacity, and then the bearing capacity of the pile can be improved to meet the engineering requirements, the pile length can be greatly reduced, thereby significantly reducing the engineering cost.
[0003] At present, the main methods for improving the bearing capacity of soil at the pile end are the method of using mechanical force to squeeze and the method of pressure grouting at the pile bottom. However, both methods have the disadvantages of relatively complex technology and relatively high cost. In particular, these two methods have poor technical effects on low-permeability clay soils. Low-permeability clay soils can hardly drain water during the short period of mechanical force squeezing, so the soil consolidation and compaction cannot be achieved through squeezing, and the soil strength cannot be improved, that is, the bearing capacity of the pile cannot be effectively improved. In pressure grouting in low-permeability soils, the solidified slurry cannot form a uniform seepage, but flows along cracks and other paths with low resistance. The slurry flow direction is uncontrollable, so it cannot form a uniform solidified soil at the pile end, and it cannot effectively and reliably improve the bearing capacity of the pile. Utility Model Content
[0004] The purpose of the utility model is to address the above-mentioned problems in the existing technology and to propose a load-bearing device for installing an expansion block at the bottom of a pile and a pile equipped with an expansion block. The load-bearing device with a built-in expansion block is connected to the bottom end of the pile. When the pile equipped with the expansion block is implanted in a designated position, the expansion block absorbs moisture in the soil layer at the pile end and produces volume expansion to compact the soil at the pile end, thereby improving the bearing capacity of the pile.
[0005] The purpose of the utility model can be achieved through the following technical solutions: a load-bearing device for installing an expansion block at the bottom of a pile, the load-bearing device comprising an upper end plate and a lower end plate, the upper end plate is connected to the pile, a support member is arranged between the upper end plate and the lower end plate, the support member separates the upper end plate from the lower end plate, an installation space is formed between the upper end plate and the lower end plate, and an expansion block is arranged in the installation space.
[0006] The utility model arranges a load-bearing device at the bottom of the pile, and places an expansion block in the load-bearing device. After the pile with the expansion block at the bottom is implanted into the ground, the expansion block absorbs pore water in the soil layer at the pile end within the time required by design, and then expands in volume, squeezes the soil layer at the pile end to drain and consolidate it, thereby increasing the bearing capacity of the soil at the pile end and reducing its compressibility, thereby increasing the bearing capacity of the pile and reducing the settlement of the pile. In order to ensure that the expansion block will not be damaged during the piling process, the load-bearing device arranged at the bottom of the pile bears the force acting on the pile end during the piling process, thereby protecting the expansion block placed in the load-bearing device.
[0007] Preferably, the support member includes an annular support tube, the upper end plate and the lower end plate are respectively arranged on the two end surfaces of the support tube, the upper end plate, the lower end plate and the support tube form the installation space, and the tube wall of the support tube is provided with a plurality of water-permeable holes connected with the installation space.
[0008] Preferably, the water-permeable holes are micropores or slits.
[0009] The utility model can ensure that the water in the soil enters the expansion block built into the load-bearing device through the water-permeable holes through the above arrangement, thereby causing the expansion block to absorb water and expand.
[0010] Preferably, the support member includes a plurality of abutment side plates, which form a support cylinder with a discontinuous ring around the cylinder wall. The upper end plate and the lower end plate are respectively arranged on the two end surfaces of the abutment side plates and connected thereto. The outer surface of the abutment side plate is flush with the periphery of the upper end plate and the lower end plate. The plurality of abutment side plates, the upper end plate and the lower end plate form an installation space for placing the expansion block.
[0011] Preferably, the support member includes at least two abutment ribs spaced apart on a plane, the upper end plate and the lower end plate are respectively arranged on the two end surfaces of the abutment ribs and connected thereto, the upper end plate, the lower end plate and the abutment ribs form an installation space for placing the expansion block, and the expansion block is arranged between two adjacent abutment ribs.
[0012] Preferably, the support member includes an abutment column, the upper end plate and the lower end plate are respectively arranged on the two end surfaces of the abutment column and connected to the abutment column, the abutment column is connected to the center of the upper end plate and the lower end plate, and the upper end plate, the lower end plate and the abutment column enclose an installation space for placing the expansion block, a hole is left in the center of the expansion block, and the expansion block is sleeved on the abutment column.
[0013] Preferably, magnet sheets are fixedly arranged between the upper end plate, the lower end plate and the support member, the upper end plate, the lower end plate and the support member are all made of steel, and the magnetic attraction force provided by the magnet sheets is lower than the expansion force generated by the expansion block; or,
[0014] A low-strength film is fixedly arranged between the upper end plate, the lower end plate and the support member, and the bonding strength of the low-strength film is smaller than the expansion force generated by the expansion block; or
[0015] The upper end plate and the lower end plate are fixed to the support member with adhesive tape, and the adhesive tape fixing strength is smaller than the expansion force generated by the expansion block; or
[0016] The lower surface of the upper end plate is provided with a groove, the upper end surface of the support member is provided with a protrusion, and the groove matches the protrusion; or,
[0017] The lower surface of the upper end plate is provided with a protrusion, and the upper end surface of the support member is provided with a groove, and the groove matches the protrusion; or
[0018] The upper surface of the lower end plate is provided with a groove, the upper end surface of the support member is provided with a protrusion, and the groove matches the protrusion; or,
[0019] The upper surface of the lower end plate is provided with a protrusion, and the upper end surface of the support member (102) is provided with a groove, and the groove matches the protrusion; or
[0020] The lower surface of the upper end plate and the upper surface of the lower end plate are both provided with grooves, and both end surfaces of the support member are both provided with protrusions, and the grooves match the protrusions; or,
[0021] The lower surface of the upper end plate and the upper surface of the lower end plate are both provided with raised parts, and both end surfaces of the support member are both provided with grooves, and the grooves match the raised parts; or,
[0022] The upper end plate is fixed to the support member by welding; or,
[0023] The lower end plate and the support member are welded; or,
[0024] The upper end plate and the support tube are fixed by screws; or,
[0025] The lower end plate and the support tube are fixed by screws.
[0026] Preferably, a conical rib is fixedly provided on the lower surface of the lower end plate. The pile driving resistance can be reduced by fixing the conical tip on the lower surface of the lower end plate or setting the lower surface of the lower end plate into a cone.
[0027] The second purpose of the utility model is to provide a pile equipped with an expansion block, comprising a pile body and a load-bearing device, wherein the load-bearing device is arranged at the bottom end of the pile body, and the pile body is selected from one of a precast pile, a pipe-sinking pile, and a cast-in-place concrete pile with a mud wall required for the pile hole.
[0028] Preferably, the pile body is a prefabricated pile, and the upper end plate is welded to the reserved iron piece at the bottom end of the prefabricated pile; or,
[0029] A low-strength rubber sheet is fixedly arranged between the upper end plate and the reserved iron piece at the bottom end of the precast pile; or,
[0030] A magnet sheet is fixedly arranged between the lower end plate and the bottom end of the prefabricated pile.
[0031] Preferably, the pile body is a pipe-sinking cast-in-place pile, the upper surface of the upper end plate of the load-bearing device is provided with a step surface, and the hole-forming steel pipe is sleeved on the step surface; or,
[0032] A limit bolt is arranged on the upper surface of the upper end plate of the load-bearing device, and when the hole-forming steel pipe is connected to the upper end plate, the inner wall of the hole-forming steel pipe abuts against the limit bolt; or,
[0033] A low-strength rubber sheet is fixedly arranged between the upper end plate of the load-bearing device and the hole-forming steel pipe; or,
[0034] A magnet sheet is fixedly arranged between the upper end plate of the load-bearing device and the hole-forming steel pipe.
[0035] The steel pipe is pressed against the load-bearing device (the load-bearing device blocks the lower end of the steel pipe), and the steel pipe and the load-bearing device are pressed into the designed underground position by static pressure. After concrete is poured into the steel pipe, the steel pipe is pulled out to form a pile with an expansion block at the bottom of the pile.
[0036] Preferably, the pile body is a cast-in-place concrete pile with a pile hole requiring mud wall protection, and the steel cage of the cast-in-place concrete pile with a pile hole requiring mud wall protection is fixedly connected to the upper end plate of the load-bearing device. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 It is one of the vertical cross-sectional structural schematic diagrams of the load-bearing device in the first embodiment;
[0038] Figure 2 This is the second schematic diagram of the vertical cross-section structure of the load-bearing device in the first embodiment;
[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of a prefabricated pile equipped with expansion blocks in Example 1;
[0040] Figure 4 It is one of the vertical cross-sectional structural schematic diagrams of the load-bearing device in the second embodiment;
[0041] Figure 5 This is the second cross-sectional structural schematic diagram of the load-bearing device in the second embodiment;
[0042] Figure 6 It is a schematic diagram of the cross-sectional structure of a pipe-sinking cast-in-place pile equipped with expansion blocks in Example 2;
[0043] Figure 7 It is one of the vertical cross-sectional structural schematic diagrams of the load-bearing device in the third embodiment;
[0044] Figure 8 This is the second cross-sectional structural schematic diagram of the load-bearing device in the third embodiment;
[0045] Fig. 9 It is a schematic diagram of the cross-sectional structure of a cast-in-place concrete pile equipped with expansion blocks in Example 3;
[0046] Fig.10 It is one of the vertical cross-sectional structural diagrams of the support member of the load-bearing device;
[0047] Fig.11 It is one of the schematic diagrams of the vertical cross-section structure of the connection between the end plate and the support member in the load-bearing device;
[0048] Fig.12 This is the second schematic diagram of the vertical cross-section structure of the connection between the end plate and the support member in the load-bearing device;
[0049] Fig.13 It is one of the schematic diagrams of the vertical section structure of the connection between the load-bearing device and the pile;
[0050] Fig.14 This is the second schematic diagram of the vertical section structure of the connection between the load-bearing device and the pile;
[0051] Fig.15 This is the third schematic diagram of the vertical section structure of the connection between the load-bearing device and the pile;
[0052] In the figure, the upper end plate 100; the lower end plate 101; the support member 102; the expansion block 103; the support tube 104; the screw 105; the magnet sheet 106; the water-permeable hole 107; the conical rib 108; the abutment column 109; the abutment rib 110; the pile body 112; the steel cage 113; the abutment side plate 114; and the steel pipe 200. DETAILED DESCRIPTION
[0053] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0054] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0055] On the one hand, a specific implementation of the utility model provides a load-bearing device for installing an expansion block at the bottom of a pile, the load-bearing device includes an upper end plate 100 and a lower end plate 101, the upper end plate 100 is connected to the pile, a support member 102 is arranged between the upper end plate 100 and the lower end plate 101, the support member 102 separates the upper end plate 100 from the lower end plate 101, an installation space is formed between the upper end plate 100 and the lower end plate 101, and an expansion block 103 is arranged in the installation space.
[0056] In a specific embodiment, the support member 102 includes an annular support tube 104, and the upper end plate 100 and the lower end plate 101 are respectively arranged on the two end surfaces of the support tube 104, and an installation space is enclosed between the upper end plate 100, the lower end plate 101 and the support tube 104, and a plurality of water-permeable holes 107 connected to the installation space are arranged on the tube wall of the support tube 104.
[0057] In a specific embodiment, the support member 102 includes a plurality of abutting side plates 114, which form a support cylinder with a discontinuous cylinder wall. The upper end plate 100 and the lower end plate 101 are respectively arranged on the two end surfaces of the abutting side plates 114 and connected thereto. The outer surface of the abutting side plates 114 is flush with the periphery of the upper end plate 100 and the lower end plate 101. The plurality of abutting side plates 114 and the upper end plate 100 and the lower end plate 101 form an installation space for placing the expansion block 103.
[0058] In a specific embodiment, the support member 102 includes at least two abutment ribs 110 spaced apart on a plane, the upper end plate 100 and the lower end plate 101 are respectively arranged on the two end surfaces of the abutment rib 110 and connected thereto, an installation space for placing the expansion block 103 is enclosed between the upper end plate 100, the lower end plate 101 and the abutment rib 110, and the expansion block 103 is arranged between two adjacent abutment ribs.
[0059] In a specific embodiment, the support member 102 includes an abutment column 109, and the upper end plate 100 and the lower end plate 101 are respectively arranged on the two end surfaces of the abutment column 109 and connected to the abutment column 109, and the abutment column 109 is connected to the center of the upper end plate 100 and the lower end plate 101. An installation space for placing the expansion block 103 is enclosed between the upper end plate 100, the lower end plate 101 and the abutment column 109, and a hole is left in the center of the expansion block 103, and the expansion block 103 is sleeved on the abutment column 109.
[0060] In a specific embodiment, a magnet sheet 106 is fixedly arranged between the upper end plate 100, the lower end plate 101 and the support member 102, and the materials of the upper end plate 100, the lower end plate 101 and the support member 102 are all steel, and the magnetic attraction provided by the magnet sheet 106 is lower than the expansion force generated by the expansion block 103; or, a low-strength film is fixedly arranged between the upper end plate 100, the lower end plate 101 and the support member 102, and the bonding strength of the low-strength film is lower than the expansion force generated by the expansion block 103; or the upper end plate 100, the lower end plate 101 and the support member 102 are fixed with tape, and the fixing strength of the tape is lower than the expansion force generated by the expansion block 103; or a groove is arranged on the lower surface of the upper end plate 100, and a protrusion is arranged on the upper end surface of the support member 102, and the groove cooperates with the protrusion; or,
[0061] The lower surface of the upper end plate 100 is provided with a protrusion, and the upper end surface of the support member 102 is provided with a groove, and the groove matches the protrusion; or,
[0062] The upper surface of the lower end plate 101 is provided with a groove, and the upper end surface of the support member 102 is provided with a protrusion, and the groove matches the protrusion; or,
[0063] The upper surface of the lower end plate 101 is provided with a protrusion, and the upper end surface of the support member 102 is provided with a groove, and the groove matches the protrusion; or,
[0064] The lower surface of the upper end plate 100 and the upper surface of the lower end plate 101 are both provided with grooves, and both end surfaces of the support member 102 are both provided with protrusions, and the grooves match the protrusions; or,
[0065] The lower surface of the upper end plate 100 and the upper surface of the lower end plate 101 are both provided with raised parts, and both end surfaces of the support member 102 are both provided with grooves, and the grooves match the raised parts; or,
[0066] The upper end plate 100 is fixed to the support member 102 by welding; or,
[0067] The lower end plate 101 is fixed to the support member 102 by welding;
[0068] The upper end plate 100 and the support tube 104 are fixed by screws 105; or,
[0069] The lower end plate 101 and the support tube 104 are fixed by screws 105 .
[0070] In a specific embodiment, a conical rib 108 is fixedly disposed on the lower surface of the lower end plate 101 .
[0071] The second aspect of the specific implementation of the utility model provides a pile equipped with an expansion block, including a pile body 112 and a load-bearing device, the load-bearing device is arranged at the bottom end of the pile body 112, and the pile body 112 is selected from one of a precast pile, a pipe-sinking cast-in-place pile, and a cast-in-place concrete pile with a mud wall required for the pile hole.
[0072] For prefabricated piles, the connection between the prefabricated pile body and the load-bearing device with built-in expansion blocks includes but is not limited to the following connection methods:
[0073] The upper end plate of the load-bearing device is welded to the reserved iron piece on the end face of the precast pile; the upper end plate of the load-bearing device and the precast pile are connected by bonding; the upper end plate of the load-bearing device and the precast pile are connected by wrapping with tape; when the upper end plate of the load-bearing device is made of steel, a magnet sheet can be set to connect the upper end plate of the load-bearing device and the end face of the precast pile by magnetic adsorption.
[0074] For cast-in-place piles, the connection between the cast-in-place piles and the load-bearing device with built-in expansion blocks includes but is not limited to the following connection methods:
[0075] The upper surface edge of the upper end plate of the load-bearing device can be sunken to form a step shape, and the perforated steel pipe is placed on the step to limit the relative horizontal displacement between the steel pipe and the load-bearing device. The steel pipe is pressed against the load-bearing device (the load-bearing device blocks the lower end of the steel pipe), and the steel pipe and the load-bearing device are pressed into the underground design position by static pressure. After pouring concrete into the steel pipe, the steel pipe is pulled out, and a pile with an expansion block installed at the bottom of the pile is formed.
[0076] A limit bolt can be set on the upper surface of the upper end plate of the load-bearing device. When the holed steel pipe is connected to the upper end plate, the inner wall of the steel pipe abuts against the limit bolt to limit the relative horizontal displacement between the steel pipe and the load-bearing device. The steel pipe is pressed against the load-bearing device, the load-bearing device blocks the lower end of the steel pipe, and the steel pipe and the load-bearing device are pressed into the underground design position by static pressure. After pouring concrete into the steel pipe, the steel pipe is pulled out to form a pile with an expansion block at the bottom of the pile.
[0077] The upper end plate of the load-bearing device and the holed steel pipe can be connected by low-strength adhesive. The bonding strength of the low-strength adhesive is less than the gravity of the concrete pile. When the steel pipe is pulled up after pouring concrete, the adhesive can be pulled off. It is used to limit the relative horizontal displacement between the steel pipe and the load-bearing device. The steel pipe is pressed against the load-bearing device, and the load-bearing device blocks the lower end of the steel pipe. The steel pipe and the load-bearing device are pressed into the underground design position by static pressure. After pouring concrete into the steel pipe, the steel pipe is pulled out, and a pile with an expansion block at the bottom of the pile is formed.
[0078] The load-bearing device and the bored steel pipe are connected by wrapping tape; the adhesive or tensile strength of the tape is less than the gravity of the concrete pile, and the tape can be pulled off when the steel pipe is pulled up after the concrete is poured. It is used to limit the relative horizontal displacement between the steel pipe and the load-bearing device. The steel pipe is pressed against the load-bearing device, and the load-bearing device blocks the lower end of the steel pipe. The steel pipe and the load-bearing device are pressed into the underground design position by static pressure. After pouring concrete into the steel pipe, the steel pipe is pulled out, and a pile with an expansion block at the bottom of the pile is formed.
[0079] When the material of the upper end plate of the load-bearing device is steel, a magnet sheet can be set to connect the upper end plate of the load-bearing device and the end face of the holed steel pipe. The magnetic attraction provided by the magnet sheet is lower than the gravity of the concrete pile, and the steel pipe can be pulled off when the concrete is poured. It is used to limit the relative horizontal displacement between the steel pipe and the load-bearing device. The steel pipe is pressed against the load-bearing device, and the load-bearing device blocks the lower end of the steel pipe. The steel pipe and the load-bearing device are pressed into the underground design position by static pressure. After pouring concrete into the steel pipe, the steel pipe is pulled out, and a pile with an expansion block at the bottom of the pile is formed.
[0080] For cast-in-place concrete piles with mud wall protection required for pile holes, the connection between the cast-in-place concrete piles with mud wall protection required for pile holes and the load-bearing device with built-in expansion blocks includes but is not limited to the following connection methods:
[0081] The upper end plate of the load-bearing device is welded to the lower end surface of the steel cage of the cast-in-place concrete pile; the load-bearing device is lowered to the bottom of the pile along with the steel cage, and then the pile body concrete is poured using the underwater concrete pouring method to form a pile with expansion blocks installed at the bottom of the pile.
[0082] At this time, the load-bearing device needs to leave a mud flow channel to ensure that the wall protection mud under the load-bearing device in the pile hole can flow up through the channel during the process of lowering the load-bearing device with the steel cage. The formation of the channel includes but is not limited to the following methods:
[0083] The cross-sectional dimensions of the load-bearing device are comparable to those of the steel cage. During the process of sinking the load-bearing device to the bottom of the pile hole, the wall protection slurry under the load-bearing device in the pile hole can flow upward through the gap between the steel cage and the pile hole wall.
[0084] The cross-sectional dimensions of the load-bearing device are comparable to those of the pile hole, but one or more vertically penetrating holes are reserved on the load-bearing device, or a plurality of vertically penetrating grooves are reserved around the load-bearing device; to ensure that in the process of sinking the load-bearing device to the bottom of the pile hole, the wall retaining mud under the load-bearing device in the pile hole can flow upward through these holes or grooves.
[0085] Embodiment 1
[0086] A load-bearing device and prefabricated piles with built-in expansion blocks. The load-bearing device is used to install expansion blocks at the bottom of the pile, and each component is made of a material with sufficient strength and rigidity. It includes an upper end plate 100 and a lower end plate 101 of the load-bearing device, and the support member is in the form of a support tube 104. A support tube 104 is arranged between the upper end plate 100 and the lower end plate 101, and the support tube 104 is welded to the lower surface of the upper end plate 100, and the support tube 104 is connected to the upper surface of the lower end plate 101 using a magnetic sheet. A plurality of slit-type water-permeable holes 107 connected to the installation space are arranged on the outer peripheral surface of the support tube 104. The support tube 104 separates the upper end plate 100 from the lower end plate 101, and an installation space is formed between the upper end plate 100 and the lower end plate 101, and an expansion block 103 is arranged in the installation space.
[0087] The upper end plate 100 of the load-bearing device with built-in expansion block is welded and fixed to the reserved iron piece at the lower end of the precast pile, and the precast pile together with the expansion device is implanted into the soil to the designed depth by hammering to form a precast pile with expansion block installed at the bottom of the pile. The expansion block 103 absorbs the pore water in the soil layer at the pile end to produce volume expansion and consolidate the soil layer at the pile end.
[0088] Embodiment 2
[0089] A load-bearing device and a pipe-sinking cast-in-place pile with a built-in expansion block. The load-bearing device is used to install the expansion block at the bottom of the pile, and each component is made of a material with sufficient strength and rigidity. It includes an upper end plate 100 and a lower end plate 101 of the load-bearing device, and the support member is in the form of an abutment column 109, which is connected to the center of the upper end plate and the lower end plate. The lower surface of the upper end plate 100 and the upper end surface of the abutment column 109 are bonded with low-strength glue. A pit corresponding to the cross-sectional size of the abutment column 109 is provided on the upper surface of the lower end plate 101, and the lower end of the abutment column 109 falls into the pit. The abutment column 109 and the lower end plate 101 are also bonded with low-strength glue. An installation space for placing the expansion block is enclosed between the upper end plate 100, the lower end plate 101 and the abutment column 109, and the expansion block 103 with a hole in the center is put on the abutment column 109.
[0090] The edge of the upper surface of the upper end plate 100 of the load-bearing device with built-in expansion blocks is sunken to form a step shape, and the bored steel pipe 200 is mounted on the step to limit the relative horizontal displacement between the steel pipe 200 and the load-bearing device. The steel pipe 200 is pressed against the load-bearing device, and the load-bearing device blocks the lower port of the steel pipe 200. The steel pipe 200 and the load-bearing device are pressed into the designed underground position by static pressure. After concrete is poured into the steel pipe 200, the steel pipe is pulled out to form a sunken cast-in-place pile with an expansion block at the bottom of the pile.
[0091] Embodiment 3
[0092] A load-bearing device with built-in expansion blocks and a cast-in-place concrete pile that requires mud wall protection. The load-bearing device is used to install expansion blocks at the bottom of the pile, and each component is made of a material with sufficient strength and rigidity. It includes an upper end plate 100 and a lower end plate 101 of the load-bearing device, and the support member is in the form of abutment ribs 110, and the ribs are at least two abutment ribs 110 distributed at intervals on the plane. The upper end plate 100, the lower end plate 101 and the support member are all made of steel. A magnet sheet 106 is arranged between the upper end plate 100 and the abutment rib 110, and the magnetic attraction provided by the magnet sheet 106 is lower than the expansion force generated by the expansion block. A pit corresponding to the cross-sectional size of the abutment rib 110 is arranged on the upper surface of the lower end plate 101, and the lower end of the abutment rib 110 falls into the pit. The abutment rib 110 and the lower end plate 101 are also fixed with a magnet sheet. The upper end plate 100 , the lower end plate 101 and the abutting ribs 110 enclose an installation space for placing the expansion block 103 , and the expansion block is arranged between two adjacent abutting ribs.
[0093] The upper end plate 100 of the load-bearing device with built-in expansion blocks is welded to the lower end surface of the steel cage 113 of the cast-in-place concrete pile. The cross-sectional size of the load-bearing device is equivalent to that of the steel cage 113 and is smaller than the size of the pile hole. In the process of sinking the load-bearing device to the bottom of the pile hole, the wall protection mud under the load-bearing device in the pile hole can flow upward through the gap between the steel cage 113 and the wall of the pile hole. The load-bearing device is lowered to the bottom of the pile along with the steel cage 113, and then the pile body concrete is poured by the underwater concrete pouring method, that is, a cast-in-place concrete pile with expansion blocks installed at the bottom of the pile is formed.
[0094] If the cast-in-place concrete pile can maintain the integrity of the hole wall without mud wall protection, the load-bearing device does not need to consider reducing the size or setting through holes, etc. The connection method of the other components does not change.
[0095] It should be noted that in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0096] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0097] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A load-bearing device for installing an expansion block at the bottom of a pile, characterized in that: The load-bearing device comprises an upper end plate (100) and a lower end plate (101); the upper end plate (100) is connected to the pile; a support member (102) is provided between the upper end plate (100) and the lower end plate (101); the support member (102) separates the upper end plate (100) from the lower end plate (101); an installation space is formed between the upper end plate (100) and the lower end plate (101); an expansion block (103) is provided in the installation space.
2. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 1, characterized in that: The support member (102) comprises an annular support tube (104), the upper end plate (100) and the lower end plate (101) are respectively arranged on the two end surfaces of the support tube (104), the upper end plate (100), the lower end plate (101) and the support tube (104) form the installation space, and the tube wall of the support tube (104) is provided with a plurality of water-permeable holes (107) connected to the installation space.
3. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 1, characterized in that: The support member (102) comprises a plurality of abutting side plates (114), the plurality of abutting side plates (114) enclosing a support cylinder with a discontinuous cylinder wall; the upper end plate (100) and the lower end plate (101) are respectively arranged on the two end surfaces of the abutting side plates (114) and connected thereto; the outer surface of the abutting side plates (114) is flush with the periphery of the upper end plate (100) and the lower end plate (101); the plurality of abutting side plates (114) and the upper end plate (100) and the lower end plate (101) enclose an installation space for placing the expansion block (103).
4. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 1, characterized in that: The support member (102) comprises at least two abutment ribs (110) spaced apart on a plane, the upper end plate (100) and the lower end plate (101) are respectively arranged on the two end surfaces of the abutment ribs (110) and connected thereto, and an installation space for placing an expansion block (103) is enclosed between the upper end plate (100), the lower end plate (101) and the abutment ribs (110), and the expansion block (103) is arranged between two adjacent abutment ribs.
5. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 1, characterized in that: The support member (102) comprises an abutment column (109); the upper end plate (100) and the lower end plate (101) are respectively arranged on the two end surfaces of the abutment column (109) and connected to the abutment column (109); the abutment column (109) is connected to the center of the upper end plate (100) and the lower end plate (101); the upper end plate (100), the lower end plate (101) and the abutment column (109) form an installation space for placing the expansion block (103); a hole is left in the center of the expansion block (103), and the expansion block (103) is sleeved on the abutment column (109).
6. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 2, characterized in that: A magnet sheet (106) is fixedly arranged between the upper end plate (100), the lower end plate (101) and the support member (102); the upper end plate (100), the lower end plate (101) and the support member (102) are all made of steel; and the magnetic attraction force provided by the magnet sheet (106) is lower than the expansion force generated by the expansion block (103); or, A low-strength film is fixedly disposed between the upper end plate (100) and the lower end plate (101) and the support member (102), and the bonding strength of the low-strength film is smaller than the expansion force generated by the expansion block (103); or, The lower surface of the upper end plate (100) is provided with a groove, the upper end surface of the support member (102) is provided with a protrusion, and the groove matches the protrusion; or, The lower surface of the upper end plate (100) is provided with a protrusion, and the upper end surface of the support member (102) is provided with a groove, and the groove matches the protrusion; or, The upper surface of the lower end plate (101) is provided with a groove, the upper end surface of the support member (102) is provided with a protrusion, and the groove matches the protrusion; or, The upper surface of the lower end plate (101) is provided with a protrusion, and the upper end surface of the support member (102) is provided with a groove, and the groove matches the protrusion; or, The lower surface of the upper end plate (100) and the upper surface of the lower end plate (101) are both provided with grooves, and both end surfaces of the support member (102) are both provided with protrusions, and the grooves match the protrusions; or, The lower surface of the upper end plate (100) and the upper surface of the lower end plate (101) are both provided with raised portions, and both end surfaces of the support member (102) are both provided with grooves, and the grooves are matched with the raised portions; or, The upper end plate (100) is fixed to the support member (102) by welding; or, The lower end plate (101) is fixed to the support member (102) by welding; or, The upper end plate (100) and the support tube (104) are fixed via a screw (105); or, The lower end plate (101) and the support cylinder (104) are fixed via a screw rod (105).
7. The load-bearing device for installing an expansion block at the bottom of a pile according to claim 1, characterized in that: A conical rib plate (108) is fixedly provided on the lower surface of the lower end plate (101).
8. A pile equipped with expansion blocks, characterized in that: The pile body (112) comprises a load-bearing device according to any one of claims 1 to 7, wherein the load-bearing device is arranged at the bottom end of the pile body (112), and the pile body (112) is selected from a precast pile, a pipe-sinking cast-in-place pile, and a cast-in-place concrete pile with a pile hole requiring mud wall protection.
9. The pile equipped with expansion blocks according to claim 8, characterized in that: The pile body (112) is a prefabricated pile, and the upper end plate (100) is welded to a reserved iron piece at the bottom end of the prefabricated pile; or, A low-strength rubber sheet is fixedly arranged between the upper end plate (100) and the reserved iron piece at the bottom end of the prefabricated pile; or, A magnet sheet is fixedly arranged between the lower end plate (101) and the bottom end of the prefabricated pile.
10. The pile equipped with expansion blocks according to claim 8, characterized in that: The pile body (112) is a pipe-sinking cast-in-place pile, the upper surface of the upper end plate (100) of the load-bearing device is provided with a stepped surface, and the hole-forming steel pipe is sleeved on the stepped surface; or, A limit bolt is provided on the upper surface of the upper end plate (100) of the load-bearing device, and when the hole-forming steel pipe is connected to the upper end plate, the inner wall of the hole-forming steel pipe (200) abuts against the limit bolt; or, A low-strength rubber sheet is fixedly arranged between the upper end plate (100) of the load-bearing device and the hole-forming steel pipe (200); or, A magnet sheet is fixedly arranged between the upper end plate (100) of the load-bearing device and the hole-forming steel pipe (200).
11. The pile equipped with expansion blocks according to claim 8, characterized in that: The pile body (112) is a cast-in-place concrete pile with a pile hole requiring mud wall protection, and the steel cage (113) of the cast-in-place concrete pile with a pile hole requiring mud wall protection is fixedly connected to the upper end plate (100) of the load-bearing device.