CN110656646A - Prefabricated pile cap for composite foundation and construction method thereof - Google Patents
Prefabricated pile cap for composite foundation and construction method thereof Download PDFInfo
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- CN110656646A CN110656646A CN201910159824.6A CN201910159824A CN110656646A CN 110656646 A CN110656646 A CN 110656646A CN 201910159824 A CN201910159824 A CN 201910159824A CN 110656646 A CN110656646 A CN 110656646A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
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Abstract
The invention discloses a prefabricated pile cap for a composite foundation, which comprises a cap top plate, a pile sleeve and a precast pile, wherein the pile sleeve is sleeved at the top of the precast pile, a convex block is arranged at the bottom of the cap top plate, the cap top plate is fixedly connected with the pile sleeve through two groups of first anchor rods which penetrate through the pile sleeve, material injection holes are vertically penetrated through the cap top plate, the bottom end of each material injection hole is positioned on the pile sleeve and provided with a second groove, the outer side of the pile sleeve is connected with a sleeve plate through a first spring, the upper part and the lower part of each sleeve plate are provided with folded edges, the folded edges at the top of the sleeve plates are abutted against the bottom of the cap top plate, and second springs are connected between the pile sleeve and the folded edges vertically. Can improve the steadiness of structure towards slip casting between stake cover and the precast pile through the notes material hole.
Description
Technical Field
The invention belongs to the technical field of building construction, in particular to a prefabricated pile cap for a composite foundation and a construction method of the prefabricated pile cap for the composite foundation.
Background
The pile cap is welded at the position of the pile head and is provided with the pile body to enter a soil layer when the engineering precast pile is constructed, so that the pile head is prevented from being damaged, the pile body is prevented from being inclined, and the pile cap can better enter a bearing layer. Pile caps in the prior art are generally made of cast-in-place reinforced concrete, and the size of the top surface of the pile cap is determined according to the width of a precast beam, the laying length of the beam and the precast installation allowable deviation. The pile cap is mainly used for protecting the pile from being damaged during pile foundation construction, and is made of steel with strong impact resistance.
The reused pile caps in the prior art are as follows:
the chinese patent application 201320221679.8 discloses a concrete pipe pile cap with an inner circle and an outer square, as shown in fig. 1, the pile cap 1 is composed of a pile cap top 11 and a pile cap edge 12, and the pile cap is carved or bonded by wood; the thickness of the pile cap top 11 is 40mm-50mm, the thickness of the pile cap edge 12 is 40mm-50mm, and the gap between the pile cap edge 12 and the concrete pipe pile outside the inner circle is 10mm-20 mm; with pile cap as for the pile bolck, effort during the pile is transmitted for interior round foreign side concrete pipe pile through the pile cap, reduces the impact to the pile head, can play the guard action to the pile head.
Chinese patent application 201720945676.7 discloses a prestressed concrete pipe pile cap, as shown in fig. 2, comprising a pile cap body, an internal bar-shaped reinforcing rib, a pile cap connecting part and a connecting sleeve, wherein a pile cap cavity is formed in the pile cap body, and the inner wall of the pile cap cavity is provided with spiral wales; the internal bar-shaped reinforcing ribs comprise a first bar-shaped reinforcing rib, a second bar-shaped reinforcing rib and a third bar-shaped reinforcing rib; the pile cap connecting part comprises an upper connecting part and a lower supporting part, a connecting cavity is formed inside the upper connecting part, and the connecting cavity is connected with the lower end of the pile cap body in a matched manner; connecting sleeve upper portion forms the connection chamber, the connecting sleeve lower part forms down the connection chamber, go up the connection chamber with the cooperation of lower support portion is connected, down connect the chamber and be connected with the cooperation of tubular pile upper end.
However, the existing pile cap adopts a cast-in-place mode, so that the structure is fixed, the assembly and disassembly are inconvenient, the adjustment is inconvenient during the installation and the use, the influence of external vibration factors such as earthquake is easily caused, and the installation stability of the structure between the pile sleeve and the precast pile is poor. And the cast-in-situ pile cap has larger error and is not easy to control the quality.
Disclosure of Invention
The invention aims to provide a prefabricated pile cap for a composite foundation and a construction method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a prefabricated pile cap for a composite foundation comprises a cap top plate, a pile sleeve and a prefabricated pile, wherein the pile sleeve is sleeved at the top of the prefabricated pile, the bottom of the cap top plate is provided with a convex block, a steel bar mesh is paved on the cap top plate, the convex block is inserted into the first groove at the top of the pile sleeve, the cap top plate is fixedly connected with the pile sleeve through two groups of first anchor rods which penetrate through the cap top plate, the convex blocks and the pile sleeve are provided with material injection holes which penetrate through the cap top plate, the convex blocks and the pile sleeve from top to bottom, the top of the material injection hole is provided with a plunger, the bottom end of the material injection hole is positioned on the pile sleeve and is provided with a second groove, the outer side of the pile sleeve is connected with a sleeve plate through a first spring, the upper part and the lower part of the sleeve plate are both provided with a hem, the hem at the top of the sleeve plate is propped against the bottom of the cap top plate, the bottom of the sleeve plate is located on the other side of the folded edge, a connecting block is arranged on the other side of the folded edge, second springs are connected between the pile sleeve and the folded edge from top to bottom, and second anchor rods penetrate through the folded edge and the connecting block.
Preferably, the matching relationship between the convex block and the first groove is a clearance fit, and the matching clearance delta is 0.8-3.5 cm.
Preferably, the cap top plate is correspondingly provided with a mounting groove corresponding to the first anchor rod head, and the depth of the mounting groove is greater than the height of the first anchor rod head.
Preferably, the plunger is a rubber plug, and a handle is arranged at the top of the plunger; the handheld part of the handle is provided with a bulge so as to increase the friction force between the handle and the hand.
Preferably, the protrusions are in the shape of arc surface, cylinder, cone, etc., the height h of the protrusions is 0.5-3.2mm, and the surface area M of the protrusions is 7.58-61.5mm2(ii) a The density K of the bulges in unit area is 3-18/cm2. Furthermore, the surface area M of the bulges and the density K of the bulges in the unit area satisfy that M.K is more than or equal to 25.5 and less than or equal to 1042. When M.K is less than 25.5, the friction force of the lifting handle is too small to be lifted easily; when M · K is larger than 1042, the protrusions at the handle holding portion are too dense, which is not favorable for further increase of friction.
Preferably, in order to further improve the friction force of the handle, facilitate lifting of the handle, ensure the matching between the protrusion and the first groove, and prevent an excessive collision in the lifting process, the matching gap δ satisfies the following relations with the height h of the protrusion, the surface area M of the protrusion, and the density K of the protrusion in a unit area:
δ＝α·(K/M)+0.5h；
wherein alpha is a clearance adjusting factor and has a value range of 0.47-2.16.
Preferably, a first through hole and a second through hole which are matched with each other are formed in the cap top plate and the pile sleeve respectively corresponding to the penetrating positions of the first anchor rods.
Preferably, the pile sleeve is provided with a first spring hole matched with the second spring at the second spring mounting position, and the folded edge is provided with a second spring hole matched with the second spring at the second spring mounting position.
Preferably, the gap between the precast pile and the second groove is not more than 5 mm.
Preferably, the first anchor rod penetrates through the reinforcing mesh, and the reinforcing mesh is embedded into the top plate of the cap.
Preferably, in order to guarantee pile cap steadiness, satisfy intensity requirement simultaneously, make it have certain fluctuation volume, first spring be the extension spring, the second spring is the pressure spring.
The invention also provides a construction method of the prefabricated pile cap for the composite foundation, which comprises the following steps:
s1: connecting two sides of the pile sleeve with the sleeve plate through a first spring, and connecting the upper and lower folded edges of the sleeve plate with the upper and lower sides of the pile sleeve through a second spring;
s2: sleeving the pile sleeve in the connected structure at the upper top end of the precast pile, driving a second anchor rod into the hem at the bottom of the sleeve plate and the connecting block, and fixing the pile sleeve and the sleeve plate structure;
s3: inserting the convex block of the cap top plate into the first groove at the top of the pile sleeve, and fixedly connecting the cap top plate and the pile sleeve by driving a first anchor rod;
s4: after the pile sleeve and the cap top plate are fixed, the plunger on the cap top plate is opened, grouting is conducted between the second groove in the pile sleeve and the precast pile through the material injection hole, and after grouting is completed, construction of the prefabricated assembled pile cap for the composite foundation is completed.
Preferably, in step S1, the wire diameter d1 of the first spring is 2.5-6.5mm, and the wire diameter d2 of the second spring is 5.8-8.5 mm.
Preferably, in order to ensure the stability of the pile cap, filter the influence of external factors on the vibration of the pile cap and the like, the wire diameter d1 of the first spring and the wire diameter d2 of the second spring satisfy the following relations:
d1＝1/2α·d2；
where α is the above gap adjustment factor.
Compared with the prior art, the invention has the following technical effects and advantages:
1. the prefabricated pile cap for the composite foundation and the construction method thereof have the advantages that the pile cap structure is formed by the prefabricated connecting structure formed by matching the cap top plate, the pile sleeve and the sleeve plate, the assembly and the disassembly are convenient, and the assembly, the assembly and the use and the adjustment are convenient.
2. According to the prefabricated pile cap for the composite foundation and the construction method thereof, the first spring structures arranged on the side surfaces of the pile sleeve and the sleeve plate can buffer the vibration action in the transverse direction, and the second spring structures connected between the pile sleeve and the folded edge up and down can buffer the vibration action in the vertical direction, so that the protective anti-seismic action is effectively provided for the prefabricated pile, and the influence of external vibration such as earthquake and the like on the structure is avoided.
3. According to the prefabricated pile cap for the composite foundation and the construction method thereof, the structure of the material injection holes penetrates through the cap top plate, the convex blocks and the pile sleeves up and down, so that grouting can be performed between the pile sleeves and the prefabricated piles through the material injection holes, and the stability of the structure is improved.
4. The invention relates to a prefabricated pile cap for a composite foundation and a construction method thereof.
5. According to the prefabricated pile cap for the composite foundation and the construction method thereof, the friction force of the lifting handle is further improved by setting the relation between the matched clearance delta and the height h of the protrusion, the surface area M of the protrusion and the density K of the protrusion in a unit area, the lifting handle is convenient to lift, the matching between the protrusion and the first groove is ensured, and overlarge collision is prevented in the lifting process.
6. The prefabricated pile cap for the composite foundation and the construction method thereof ensure the stability of the pile cap and filter the influence of the outside on the pile cap, such as vibration and the like, by setting the type and the diameter relationship of the first spring and the second spring.
Drawings
Fig. 1 is a schematic view of a pile cap of a concrete pipe pile with an inner circle and an outer square in the prior art;
FIG. 2 is a schematic view of a pile cap of a prestressed concrete tubular pile according to the prior art;
FIG. 3 is a schematic structural view of a prefabricated pile cap for a composite foundation according to the present invention;
FIG. 4 is a schematic view showing a cap top plate structure of a prefabricated pile cap for a composite foundation according to the present invention;
FIG. 5 is a schematic structural diagram of a prefabricated pile cap pile cover for a composite foundation according to the present invention;
FIG. 6 is a schematic structural view of a prefabricated pile cap sheathing plate for a composite foundation according to the present invention;
fig. 7 is a flowchart illustrating a construction method of the prefabricated pile cap for a composite foundation according to the present invention.
In FIGS. 3-7: the pile structure comprises a 1-cap top plate, a 2-pile sleeve, a 3-precast pile, a 4-bump, a 5-mesh reinforcement, a 6-first anchor rod, a 601-first through hole, a 602-second through hole, a 7-mounting groove, an 8-injection hole, a 9-plunger, a 901-handle, a 10-second groove, a 11-first groove, a 12-first spring, a 13-sleeve plate, a 14-folded edge, a 15-second spring, a 16-connecting block, a 17-second anchor rod, an 18-second spring hole and a 19-first spring hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 3-6, a prefabricated pile cap for composite foundation comprises a cap top plate 1, a pile sleeve 2 and a precast pile 3, wherein the pile sleeve 2 is sleeved on the top of the precast pile 3, a bump 4 is arranged at the bottom of the cap top plate 1, a steel mesh 5 is laid on the cap top plate 1, the bump 4 is inserted into a first groove 11 at the top of the pile sleeve 2, the bump 4 is matched with the first groove 11, and the cap top plate 1 is inserted into the top of the pile sleeve 2; the cap top plate 1 is fixedly connected with the pile sleeve 2 through two groups of first anchor rods 6 which penetrate through the cap top plate 1, the convex block 4 and the pile sleeve 2, and material injection holes 8 penetrate through the upper part and the lower part of the pile sleeve 2, and the material injection holes 8 are used for grouting a gap between the pile sleeve 2 and the precast pile 3; a plunger 9 is arranged at the top of the material injection hole 8, a second groove 10 is formed in the position, located on the pile sleeve 2, of the bottom end of the material injection hole 8, the outer side of the pile sleeve 2 is connected with a sleeve plate 13 through a first spring 12, and the first spring 12 provides a transverse anti-seismic effect; the upper and lower parts of the sleeve plate 13 are provided with folded edges 14, the folded edge 14 at the top of the sleeve plate 13 abuts against the bottom of the cap top plate 1, the bottom of the sleeve plate 13 is provided with a connecting block 16 at the other side of the folded edge 14, a second spring 15 is connected between the upper part and the lower part of the pile sleeve 2 and the folded edge 14, and the second spring 15 provides a longitudinal anti-seismic effect; and a second anchor rod 17 penetrates through the folded edge 14 and the connecting block 16, and the second anchor rod 17 can fix the structures of the folded edge 14 and the connecting block 16 and is stable in installation.
The matching relation between the convex block 4 and the first groove 11 is clearance fit. The fit relationship between the protrusion 4 and the first groove 11 is a clearance fit, so that the protrusion 4 can be inserted into the first groove 11 conveniently.
The cap top plate 1 is correspondingly provided with a mounting groove 7 corresponding to the position of the head of the first anchor rod 6, and the depth of the mounting groove 7 is greater than the height of the head of the first anchor rod 6. The design of mounting groove 7 is convenient to be received the pole head position of first stock 6 in the groove, simple to operate.
And a first through hole 601 and a second through hole 602 which are matched with each other are respectively arranged on the cap top plate 1 and the pile sleeve 2 corresponding to the penetrating positions of the first anchor rods 6. The first through hole 601 and the second through hole 602 which are matched are arranged, so that the first anchor rod 6 is convenient to mount.
The pile sleeve 2 is provided with a first spring hole 19 at the upper and lower positions of the second spring 15, and the folded edge 14 is provided with a second spring hole 18 at the position of the second spring 15. The first spring hole 19 and the second spring hole 18 are structurally designed, so that the second spring 15 is conveniently and structurally connected with the pile sleeve 2 and the folded edge 14 respectively, and is convenient to install.
The gap between the precast pile 3 and the second groove 10 is not more than 5 mm. The preformed gap is reserved, grouting treatment is conveniently carried out, and the connection stability of the precast pile 3 and the pile sleeve 2 structure is improved.
The first anchor rod 6 penetrates through the steel bar mesh 5, and the steel bar mesh 5 is embedded into the cap top plate 1. The reinforcing mesh 5 is embedded into the cap top plate 1, and the first anchor rod 6 penetrates through the reinforcing mesh 5, so that the first anchor rod 6 is stably installed.
As shown in fig. 7, the present invention also provides a construction method of a prefabricated pile cap for a composite foundation, comprising the steps of:
s1: connecting two sides of the pile sleeve with the sleeve plate through a first spring, and connecting the upper and lower folded edges of the sleeve plate with the upper and lower sides of the pile sleeve through a second spring;
s2: sleeving the pile sleeve in the connected structure at the upper top end of the precast pile, driving a second anchor rod into the hem at the bottom of the sleeve plate and the connecting block, and fixing the pile sleeve and the sleeve plate structure;
s3: inserting the convex block of the cap top plate into the first groove at the top of the pile sleeve, and fixedly connecting the cap top plate and the pile sleeve by driving a first anchor rod;
s4: after the pile sleeve and the cap top plate are fixed, the plunger on the cap top plate is opened, grouting is conducted between the second groove in the pile sleeve and the precast pile through the material injection hole, and after grouting is completed, construction of the prefabricated assembled pile cap for the composite foundation is completed.
In summary, the following steps: the pile cap structure formed by the pre-assembly type connecting structure formed by matching the cap top plate 1, the pile sleeve 2 and the sleeve plate 13 is convenient to assemble, disassemble and assemble and convenient to install and use, the vibration action in the transverse direction can be buffered by the first spring 12 structure arranged on the side surface of the pile sleeve 2 and the sleeve plate 13, the vibration action in the vertical direction can be buffered by the second spring 15 structure connected between the pile sleeve 2 and the folded edge 14 up and down, the protection and anti-seismic action is effectively provided for the precast pile 3, the influence of external vibration such as earthquake and the like on the structure is avoided, the structure of the material injection hole 8 penetrates through the cap top plate 1, the convex block 4 and the pile sleeve 2 up and down, the grouting can be carried out between the pile sleeve 2 and the precast pile 3 through the material injection hole 8, and the stability of the structure is improved.
Example 2
A prefabricated assembly type pile cap for a composite foundation comprises a cap top plate 1, a pile sleeve 2 and a precast pile 3, wherein the pile sleeve 2 is sleeved on the top of the precast pile 3, a convex block 4 is arranged at the bottom of the cap top plate 1, a steel mesh 5 is paved on the cap top plate 1, the convex block 4 is inserted into a first groove 11 at the top of the pile sleeve 2, the convex block 4 is matched with the first groove 11, and the cap top plate 1 is inserted into the top of the pile sleeve 2; the cap top plate 1 is fixedly connected with the pile sleeve 2 through two groups of first anchor rods 6 which penetrate through the cap top plate 1, the convex block 4 and the pile sleeve 2, and material injection holes 8 penetrate through the upper part and the lower part of the pile sleeve 2, and the material injection holes 8 are used for grouting a gap between the pile sleeve 2 and the precast pile 3; a plunger 9 is arranged at the top of the material injection hole 8, a second groove 10 is formed in the position, located on the pile sleeve 2, of the bottom end of the material injection hole 8, the outer side of the pile sleeve 2 is connected with a sleeve plate 13 through a first spring 12, and the first spring 12 provides a transverse anti-seismic effect; the upper and lower parts of the sleeve plate 13 are provided with folded edges 14, the folded edge 14 at the top of the sleeve plate 13 abuts against the bottom of the cap top plate 1, the bottom of the sleeve plate 13 is provided with a connecting block 16 at the other side of the folded edge 14, a second spring 15 is connected between the upper part and the lower part of the pile sleeve 2 and the folded edge 14, and the second spring 15 provides a longitudinal anti-seismic effect; and a second anchor rod 17 penetrates through the folded edge 14 and the connecting block 16, and the second anchor rod 17 can fix the structures of the folded edge 14 and the connecting block 16 and is stable in installation.
The matching relation between the convex block 4 and the first groove 11 is clearance fit. The fit relationship between the protrusion 4 and the first groove 11 is a clearance fit, so that the protrusion 4 can be inserted into the first groove 11 conveniently.
The cap top plate 1 is correspondingly provided with a mounting groove 7 corresponding to the position of the head of the first anchor rod 6, and the depth of the mounting groove 7 is greater than the height of the head of the first anchor rod 6. The design of mounting groove 7 is convenient to be received the pole head position of first stock 6 in the groove, simple to operate.
The plunger is a rubber plug, and the top of the plunger is provided with a handle; the handheld part of the handle is provided with a bulge so as to increase the friction force between the handle and the hand.
The convex partThe protrusions are in the shape of arc surface, cylinder, cone, etc., the height h of the protrusions is 0.5-3.2mm, and the surface area M of the protrusions is 7.58-61.5mm2(ii) a The density K of the bulges in unit area is 3-18/cm2. Furthermore, the surface area M of the bulges and the density K of the bulges in the unit area satisfy that M.K is more than or equal to 25.5 and less than or equal to 1042. When M.K is less than 25.5, the friction force of the lifting handle is too small to be lifted easily; when M · K is larger than 1042, the protrusions at the handle holding portion are too dense, which is not favorable for further increase of friction.
In order to ensure the stability of the pile cap and meet the strength requirement, the pile cap has certain variation, the first spring is a tension spring, and the second spring is a compression spring.
And a first through hole 601 and a second through hole 602 which are matched with each other are respectively arranged on the cap top plate 1 and the pile sleeve 2 corresponding to the penetrating positions of the first anchor rods 6. The first through hole 601 and the second through hole 602 which are matched are arranged, so that the first anchor rod 6 is convenient to mount.
The pile sleeve 2 is provided with a first spring hole 19 at the upper and lower positions of the second spring 15, and the folded edge 14 is provided with a second spring hole 18 at the position of the second spring 15. The first spring hole 19 and the second spring hole 18 are structurally designed, so that the second spring 15 is conveniently and structurally connected with the pile sleeve 2 and the folded edge 14 respectively, and is convenient to install.
The gap between the precast pile 3 and the second groove 10 is not more than 5 mm. The preformed gap is reserved, grouting treatment is conveniently carried out, and the connection stability of the precast pile 3 and the pile sleeve 2 structure is improved.
The first anchor rod 6 penetrates through the steel bar mesh 5, and the steel bar mesh 5 is embedded into the cap top plate 1. The reinforcing mesh 5 is embedded into the cap top plate 1, and the first anchor rod 6 penetrates through the reinforcing mesh 5, so that the first anchor rod 6 is stably installed.
As shown in fig. 7, the present invention also provides a construction method of a prefabricated pile cap for a composite foundation, comprising the steps of:
s1: connecting two sides of the pile sleeve with the sleeve plate through a first spring, and connecting the upper and lower folded edges of the sleeve plate with the upper and lower sides of the pile sleeve through a second spring;
s2: sleeving the pile sleeve in the connected structure at the upper top end of the precast pile, driving a second anchor rod into the hem at the bottom of the sleeve plate and the connecting block, and fixing the pile sleeve and the sleeve plate structure;
s3: inserting the convex block of the cap top plate into the first groove at the top of the pile sleeve, and fixedly connecting the cap top plate and the pile sleeve by driving a first anchor rod;
s4: after the pile sleeve and the cap top plate are fixed, the plunger on the cap top plate is opened, grouting is conducted between the second groove in the pile sleeve and the precast pile through the material injection hole, and after grouting is completed, construction of the prefabricated assembled pile cap for the composite foundation is completed.
Example 3
A prefabricated assembly type pile cap for a composite foundation comprises a cap top plate 1, a pile sleeve 2 and a precast pile 3, wherein the pile sleeve 2 is sleeved on the top of the precast pile 3, a convex block 4 is arranged at the bottom of the cap top plate 1, a steel mesh 5 is paved on the cap top plate 1, the convex block 4 is inserted into a first groove 11 at the top of the pile sleeve 2, the convex block 4 is matched with the first groove 11, and the cap top plate 1 is inserted into the top of the pile sleeve 2; the cap top plate 1 is fixedly connected with the pile sleeve 2 through two groups of first anchor rods 6 which penetrate through the cap top plate 1, the convex block 4 and the pile sleeve 2, and material injection holes 8 penetrate through the upper part and the lower part of the pile sleeve 2, and the material injection holes 8 are used for grouting a gap between the pile sleeve 2 and the precast pile 3; a plunger 9 is arranged at the top of the material injection hole 8, a second groove 10 is formed in the position, located on the pile sleeve 2, of the bottom end of the material injection hole 8, the outer side of the pile sleeve 2 is connected with a sleeve plate 13 through a first spring 12, and the first spring 12 provides a transverse anti-seismic effect; the upper and lower parts of the sleeve plate 13 are provided with folded edges 14, the folded edge 14 at the top of the sleeve plate 13 abuts against the bottom of the cap top plate 1, the bottom of the sleeve plate 13 is provided with a connecting block 16 at the other side of the folded edge 14, a second spring 15 is connected between the upper part and the lower part of the pile sleeve 2 and the folded edge 14, and the second spring 15 provides a longitudinal anti-seismic effect; and a second anchor rod 17 penetrates through the folded edge 14 and the connecting block 16, and the second anchor rod 17 can fix the structures of the folded edge 14 and the connecting block 16 and is stable in installation.
The matching relation between the convex block 4 and the first groove 11 is clearance fit. The fit relationship between the protrusion 4 and the first groove 11 is a clearance fit, so that the protrusion 4 can be inserted into the first groove 11 conveniently.
The cap top plate 1 is correspondingly provided with a mounting groove 7 corresponding to the position of the head of the first anchor rod 6, and the depth of the mounting groove 7 is greater than the height of the head of the first anchor rod 6. The design of mounting groove 7 is convenient to be received the pole head position of first stock 6 in the groove, simple to operate.
The plunger is a rubber plug, and the top of the plunger is provided with a handle; the handheld part of the handle is provided with a bulge so as to increase the friction force between the handle and the hand.
The protrusions are in the shape of arc surface, cylinder, cone, etc., the height h of the protrusions is 0.5-3.2mm, and the surface area M of the protrusions is 7.58-61.5mm2(ii) a The density K of the bulges in unit area is 3-18/cm2. Furthermore, the surface area M of the bulges and the density K of the bulges in the unit area satisfy that M.K is more than or equal to 25.5 and less than or equal to 1042. When M.K is less than 25.5, the friction force of the lifting handle is too small to be lifted easily; when M · K is larger than 1042, the protrusions at the handle holding portion are too dense, which is not favorable for further increase of friction.
In order to further improve the friction force of the handle, facilitate lifting of the handle, ensure matching between the convex block and the first groove and prevent overlarge collision in the lifting process, the matched gap delta, the height h of the convex block, the surface area M of the convex block and the density K of the convex block in a unit area satisfy the following relations:
δ＝α·(K/M)+0.5h；
wherein alpha is a clearance adjusting factor and has a value range of 0.47-2.16.
And a first through hole 601 and a second through hole 602 which are matched with each other are respectively arranged on the cap top plate 1 and the pile sleeve 2 corresponding to the penetrating positions of the first anchor rods 6. The first through hole 601 and the second through hole 602 which are matched are arranged, so that the first anchor rod 6 is convenient to mount.
The pile sleeve 2 is provided with a first spring hole 19 at the upper and lower positions of the second spring 15, and the folded edge 14 is provided with a second spring hole 18 at the position of the second spring 15. The first spring hole 19 and the second spring hole 18 are structurally designed, so that the second spring 15 is conveniently and structurally connected with the pile sleeve 2 and the folded edge 14 respectively, and is convenient to install.
The gap between the precast pile 3 and the second groove 10 is not more than 5 mm. The preformed gap is reserved, grouting treatment is conveniently carried out, and the connection stability of the precast pile 3 and the pile sleeve 2 structure is improved.
The first anchor rod 6 penetrates through the steel bar mesh 5, and the steel bar mesh 5 is embedded into the cap top plate 1. The reinforcing mesh 5 is embedded into the cap top plate 1, and the first anchor rod 6 penetrates through the reinforcing mesh 5, so that the first anchor rod 6 is stably installed.
As shown in fig. 7, the present invention also provides a construction method of a prefabricated pile cap for a composite foundation, comprising the steps of:
s1: connecting two sides of the pile sleeve with the sleeve plate through a first spring, and connecting the upper and lower folded edges of the sleeve plate with the upper and lower sides of the pile sleeve through a second spring; the diameter d1 of the spring wire of the first spring is 2.5-6.5mm, and the diameter d2 of the spring wire of the second spring is 5.8-8.5 mm; in order to ensure the stability of the pile cap, filter the influence of external factors on the vibration of the pile cap and the like, the spring wire diameter d1 of the first spring and the spring wire diameter d2 of the second spring satisfy the following relations:
d1＝1/2α·d2；
s2: sleeving the pile sleeve in the connected structure at the upper top end of the precast pile, driving a second anchor rod into the hem at the bottom of the sleeve plate and the connecting block, and fixing the pile sleeve and the sleeve plate structure;
s3: inserting the convex block of the cap top plate into the first groove at the top of the pile sleeve, and fixedly connecting the cap top plate and the pile sleeve by driving a first anchor rod;
s4: after the pile sleeve and the cap top plate are fixed, the plunger on the cap top plate is opened, grouting is conducted between the second groove in the pile sleeve and the precast pile through the material injection hole, and after grouting is completed, construction of the prefabricated assembled pile cap for the composite foundation is completed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a compound foundation is with prefabricated assembled pile cap, includes cap roof (1), pile cover (2) and precast pile (3), its characterized in that: the pile sleeve (2) is sleeved at the top of a precast pile (3), a convex block (4) is arranged at the bottom of the cap top plate (1), a reinforcing mesh (5) is paved on the cap top plate (1), the convex block (4) is inserted into a first groove (11) at the top of the pile sleeve (2), the cap top plate (1) is fixedly connected with the pile sleeve (2) through two groups of first anchor rods (6) which penetrate through the pile sleeve (2), material injection holes (8) penetrate through the cap top plate (1), the convex block (4) and the pile sleeve (2) from top to bottom, a plunger (9) is arranged at the top of each material injection hole (8), a second groove (10) is formed in the bottom end of each material injection hole (8) and positioned on the pile sleeve (2), sleeve plates (13) are connected to the outer side of the pile sleeve (2) through first springs (12), folding edges (14) are arranged on the upper and the lower parts of the sleeve plates (13), and the folding edges (14) at the top of the top, the pile sleeve is characterized in that a connecting block (16) is arranged at the other side of the folded edge (14) at the bottom of the sleeve plate (13), second springs (15) are connected between the pile sleeve (2) and the folded edge (14) up and down, and second anchor rods (17) penetrate through the folded edge (14) and the connecting block (16).
2. The prefabricated pile cap for a composite foundation according to claim 1, wherein: the matching relationship between the convex block (4) and the first groove (11) is clearance fit.
3. The prefabricated pile cap for a composite foundation according to claim 1 or 2, wherein: the cap top plate (1) is correspondingly provided with a mounting groove (7) corresponding to the head position of the first anchor rod (6), and the depth of the mounting groove (7) is greater than the height of the head of the first anchor rod (6).
4. The prefabricated pile cap for a composite foundation according to claims 1 to 3, wherein: plunger (9) are the rubber buffer, plunger (9) top is equipped with handle (901).
5. The prefabricated pile cap for a composite foundation according to claims 1 to 4, wherein: a first through hole (601) and a second through hole (602) which are matched with each other are formed in the cap top plate (1) and the pile sleeve (2) corresponding to the penetrating positions of the first anchor rods (6).
6. The prefabricated pile cap for a composite foundation according to claims 1 to 5, wherein: the pile sleeve (2) is provided with a first spring hole (19) which is matched with the second spring (15) at the upper and lower positions, and a second spring hole (18) which is matched with the second spring (15) at the upper position of the folded edge (14).
7. A construction method of a prefabricated pile cap for a composite foundation according to claims 1 to 6, wherein: the construction method comprises the following steps:
s1: connecting two sides of the pile sleeve with the sleeve plate through a first spring, and connecting the upper and lower folded edges of the sleeve plate with the upper and lower sides of the pile sleeve through a second spring;
s2: sleeving the pile sleeve in the connected structure at the upper top end of the precast pile, driving a second anchor rod into the hem at the bottom of the sleeve plate and the connecting block, and fixing the pile sleeve and the sleeve plate structure;
s3: inserting the convex block of the cap top plate into the first groove at the top of the pile sleeve, and fixedly connecting the cap top plate and the pile sleeve by driving a first anchor rod;
s4: after the pile sleeve and the cap top plate are fixed, the plunger on the cap top plate is opened, grouting is conducted between the second groove in the pile sleeve and the precast pile through the material injection hole, and after grouting is completed, construction of the prefabricated assembled pile cap for the composite foundation is completed.
8. A construction method of the prefabricated pile cap for a composite foundation according to claim 7, wherein: in step S1, the wire diameter d1 of the first spring is 2.5-6.5mm, and the wire diameter d2 of the second spring is 5.8-8.5 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159824.6A CN110656646A (en) | 2019-03-04 | 2019-03-04 | Prefabricated pile cap for composite foundation and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910159824.6A CN110656646A (en) | 2019-03-04 | 2019-03-04 | Prefabricated pile cap for composite foundation and construction method thereof |
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| CN110656646A true CN110656646A (en) | 2020-01-07 |
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| CN201910159824.6A Pending CN110656646A (en) | 2019-03-04 | 2019-03-04 | Prefabricated pile cap for composite foundation and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113216184A (en) * | 2021-03-26 | 2021-08-06 | 中铁第五勘察设计院集团有限公司 | Substitute printing device |
| CN114753706A (en) * | 2022-03-29 | 2022-07-15 | 浙江天弘机器人科技有限公司 | Self-testing type pile anchor |
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| CN114753706B (en) * | 2022-03-29 | 2024-05-17 | 浙江天弘机器人科技有限公司 | Self-testing pile anchor |
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