CN224031663U - Composite post grouting device for cast-in-place pile - Google Patents

Abstract

The utility model relates to the technical field of cast-in-place pile construction and discloses a cast-in-place pile composite post grouting device. The composite post grouting device for the cast-in-situ pile comprises a top plate, a bottom plate, a connecting cylinder, a grouting bag and a grouting assembly, wherein the top plate and the bottom plate are respectively provided with a first through hole and a second through hole, the connecting cylinder is provided with a hollow cavity, the top plate and the bottom plate are arranged at two ends of the connecting cylinder, the two through holes and the hollow cavity are connected into a channel, the grouting bag, the top plate, the outer wall of the connecting cylinder and the bottom plate enclose the grouting cavity, an open grouting pipe in the grouting assembly is arranged in the channel, and one end of the closed grouting pipe stretches into the grouting cavity. The back slip casting device sets up in the drilling bottom, and after pouring concrete in to the drilling in order to form the bored concrete pile, through open slip casting pipe to the stratum slip casting of pile bottom, the slip casting is in the closed slip casting pipe to the storage slip casting bag, finally can expand at the pile bottom and form the enlarged head, because the existence of enlarged head can improve the frictional resistance and the pulling resistance of pile body after the concrete solidification shaping bored concrete pile in the drilling, the bearing capacity of bored concrete pile is higher.

Description

Composite post grouting device for cast-in-place pile

Technical Field

The utility model relates to the technical field of cast-in-place pile construction, in particular to a cast-in-place pile composite post grouting device.

Background

The cast-in-place pile can be applied to various construction projects such as high-rise buildings, bridges, tunnels and the like, and can safely and stably provide a solid foundation for the building. The cast-in-place pile is a pile which is formed by directly perforating a pile position and then casting concrete or reinforced concrete. The concrete construction process is that firstly, holes are formed in pile positions with proper geological conditions through drilling equipment such as a rotary drilling machine, and after the holes are formed, hole bottom sediments are removed through hole cleaning methods such as a vacuum mud residue suction method, a water jet residue extraction method, a slurry changing method, a residue drawing method and the like. And then placing the reinforcement cage manufactured in advance in the hole, pouring concrete or directly pouring concrete, and finally forming the pile body.

However, after the construction of the existing cast-in-place pile is completed, because the contact area of the pile body is fixed, the friction resistance and the pulling resistance of the cast-in-place pile are limited, the overall bearing capacity is smaller, and the stability of a building arranged on the cast-in-place pile is poor.

Disclosure of utility model

In view of the above, the utility model provides a composite post grouting device for a cast-in-place pile, which aims to solve the problems of limited friction and pulling resistance of the existing cast-in-place pile, small overall bearing capacity and poor stability of a building arranged on the cast-in-place pile.

In a first aspect, the present utility model provides a composite post grouting device for a cast-in-place pile, which is disposed at the bottom of a borehole, and includes:

The top plate is provided with a first through hole;

the bottom plate is provided with a second through hole;

the connecting cylinder is provided with a hollow cavity with two open ends, the top plate and the bottom plate are respectively arranged at the two ends of the connecting cylinder, and the first through hole, the hollow cavity and the second through hole are communicated to form a channel;

The pulp storage bag is arranged on the periphery of the connecting cylinder, two ends of the pulp storage bag are respectively connected with the top plate and the bottom plate, and the pulp storage bag, the top plate, the outer wall of the connecting cylinder and the bottom plate form a pulp storage cavity;

The grouting assembly comprises an open grouting pipe and a closed grouting pipe, wherein the open grouting pipe is arranged in the channel, and one end of the closed grouting pipe extends into the grouting storage cavity.

Advantageous effects

And after the drilling hole is drilled, placing the post grouting device at the bottom of the drilling hole, and then pouring concrete into the drilling hole. Grouting to the pile bottom through an open grouting pipe after concrete is poured to enable grout to infiltrate into surrounding stratum, grouting to the grout storage cavity through a closed grouting pipe, expanding and expanding the grout storage bag, compacting and solidifying the surrounding stratum and grout, and finally forming an expansion head at the pile bottom. After the concrete in the drilled hole is coagulated to form the cast-in-place pile, the expansion head at the pile bottom can expand the contact area with the stratum, so that the friction resistance and the pulling resistance of the pile body are improved, and the bearing capacity of the cast-in-place pile is further improved. The building arranged on the filling pile is more stable and safer.

In an alternative embodiment, the channel is circular or oval in cross-section perpendicular to its axis.

In an alternative embodiment, the size of the first through hole is smaller than the size of the second through hole.

In an alternative embodiment, a stiffening assembly is disposed within the channel.

In an alternative embodiment, the reinforcement assembly includes a plurality of transverse stiffeners disposed crosswise to the second through hole.

In an alternative embodiment, the reinforcement assembly further comprises a plurality of vertical reinforcement members circumferentially spaced along the channel from an inner wall thereof.

In an alternative embodiment, one end of the vertical stiffener is connected to one end of the lateral stiffener.

Advantageous effects

The structural strength of the rear grouting device can be improved by the aid of the reinforcing component, and the rear grouting device is firm and durable.

In an alternative embodiment, one end of the closed grouting pipe extends into the slurry storage cavity through the top plate.

In an alternative embodiment, one end of the open grouting pipe and one end of the closed grouting pipe are provided with one-way valves.

Advantageous effects

The one-way valve can prevent the slurry from flowing back.

In an alternative embodiment, the pulp storage bag is made of chemical fiber tape material.

Advantageous effects

The slurry storage bag made of the chemical fiber adhesive tape material can expand the bag body, so that an expansion head can be formed at the pile bottom.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of a composite post-grouting device for cast-in-place piles according to embodiment 1 of the present utility model;

fig. 2 is a top view of a composite post-grouting device for cast-in-place piles according to embodiment 1 of the present utility model;

FIG. 3 is a schematic view of a forming borehole during construction of a cast-in-place pile according to embodiment 1 of the present utility model;

Fig. 4 is a schematic view of a post-grouting device set in the process of construction of a cast-in-place pile according to embodiment 1 of the present utility model;

FIG. 5 is a schematic view of an enlarged footing formed by grouting with a post-grouting device during the construction of a cast-in-place pile according to embodiment 1 of the present utility model;

fig. 6 is a top view of a composite post-grouting device for cast-in-place piles according to embodiment 2 of the present utility model;

Fig. 7 is a bottom view of a composite post-grouting device for cast-in-place piles according to embodiment 3 of the present utility model;

fig. 8 is a bottom view of a composite post-grouting device for cast-in-place piles according to embodiment 4 of the present utility model;

fig. 9 is a schematic diagram illustrating connection between a composite post grouting device and a pile bottom grouting device for a cast-in-place pile according to embodiment 5 of the present utility model;

FIG. 10 is a schematic view of a composite post grouting device and a pile bottom grouting device for a cast-in-place pile according to embodiment 5 of the present utility model;

Fig. 11 is a schematic diagram of a composite post grouting device and a pile bottom grouting device for forming an enlarged head at the pile bottom in embodiment 5 of the present utility model.

Reference numerals illustrate:

1. Drilling holes;

2. A composite post grouting device for the cast-in-place pile;

21. A top plate;

22. A bottom plate;

23. a connecting cylinder;

24. A pulp storage bag;

251. An open grouting pipe, 252, a closed grouting pipe, 253 and a one-way valve;

261. A transverse reinforcement, 262, a vertical reinforcement;

3. Pile bottom grouting device 31, fixed plate 32, grouting pipe 33, grouting capsule.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Embodiments of the present utility model are described below with reference to fig. 1 to 5.

According to an embodiment of the present utility model, in one aspect, there is provided a bored pile composite type rear grouting device 2 including a top plate 21, a bottom plate 22, a connecting cylinder 23, a grout bag 24 and a grouting assembly. The top plate 21 is provided with a first through hole, the bottom plate 22 is provided with a second through hole, the connecting cylinder 23 is provided with a hollow cavity with two open ends, the top plate 21 and the bottom plate 22 are respectively arranged at two ends of the connecting cylinder 23, the first through hole, the hollow cavity and the second through hole are communicated to form a channel, the slurry storage bag 24 is arranged at the periphery of the connecting cylinder 23, two ends of the slurry storage bag are respectively connected with the top plate 21 and the bottom plate 22, the slurry storage bag 24, the top plate 21, the outer wall of the connecting cylinder 23 and the bottom plate 22 enclose a slurry storage cavity, the slurry injection assembly comprises an open slurry injection pipe 251 and a closed slurry injection pipe 252, the open slurry injection pipe 251 is arranged in the channel, and one end of the closed slurry injection pipe 252 stretches into the slurry storage cavity.

The composite post grouting device 2 for the cast-in-place pile is arranged at the bottom of the drilling hole 1, and a top plate 21, a bottom plate 22 and a connecting cylinder 23 form a main body structure of the post grouting device, which is a main bearing component. The storage bag 24 and grouting assembly are primarily used for subsequent grouting. Specifically, the top plate 21, the bottom plate 22 and the connecting tube 23 are generally made of metal, and have sufficient rigidity and supporting strength. For example, the top plate 21 and the bottom plate 22 may be steel plates, the connecting cylinder 23 may be a steel cylinder, and the top plate 21, the connecting cylinder 23, and the bottom plate 22 may be connected by welding. Openings are needed on the top plate 21 and the bottom plate 22, namely, a first through hole on the top plate 21 and a second through hole on the bottom plate 22, and a hollow cavity is arranged in the middle of the connecting cylinder 23, so that after the top plate 21 and the bottom plate 22 are arranged at two ends of the connecting cylinder 23, the first through hole, the hollow cavity and the second through hole can be communicated to form a channel. The channel is arranged firstly to facilitate the subsequent arrangement of the open grouting pipe 251, and the channel is arranged secondly to enable concrete to be poured into the channel and enable the post grouting device and the cast-in-place pile body to be fixedly combined into a whole subsequently. The bag body of the pulp storing bag 24 is flexible and expandable, the pulp storing bag 24 is enclosed outside the connecting cylinder 23, and the two ends are connected and sealed with the top plate 21 and the bottom plate 22, so that a closed pulp storing cavity is formed by enclosing the top plate 21, the outer wall of the connecting cylinder 23 and the bottom plate 22. The open type grouting pipe 251 is used for open type grouting, i.e., grouting to an open space of the pile bottom, so the open type grouting pipe 251 is disposed in the channel and can be welded to the inner wall of the connection cylinder 23. The closed grouting pipe 252 is used for closed grouting, namely grouting to a closed space in the grouting cavity, so that one end of the closed grouting pipe 252 needs to extend into the grouting cavity. The open type grouting pipe 251 and the closed type grouting pipe 252 may be one or a plurality of. The injected slurry can be cement slurry or cement mortar.

And when the drilling hole 1 is drilled, placing a rear grouting device at the bottom of the drilling hole 1, and then pouring concrete into the drilling hole 1, wherein the poured concrete is the pile body of the cast-in-place pile after forming. After concrete is poured, grouting is carried out by a post grouting device, and the grouting process is that open grouting is carried out first and then closed grouting is carried out. After grouting is performed to the pile bottom through the open grouting pipe 251, grout can infiltrate into soil mass of surrounding stratum, so that the grout can be coagulated into a whole with the surrounding stratum after coagulation. Grouting is carried out into the grouting cavity through the closed grouting pipe 252, along with the increase of grouting amount, the grouting bag 24 is gradually expanded, surrounding soil is extruded, the soil and the grouting are compacted, and finally expanded and coagulated into an expansion head at the pile bottom position. And the concrete in the borehole 1 is integrated with the post grouting device after being coagulated.

Because the volume of the pile bottom expansion head is larger than the space at the bottom of the original drilling hole 1, the contact area of the cast-in-situ pile and the soil body is increased, and the soil body of surrounding stratum and slurry are compacted and solidified in the process of forming the expansion head, so that the friction between the cast-in-situ pile and the soil body and the pulling resistance of the pile bottom expansion head are increased, the bearing capacity of the cast-in-situ pile is improved, and a building arranged on the cast-in-situ pile is more stable and safer.

In one embodiment, the pulp storage bag 24 is made of a chemical fiber blanket material.

The chemical fiber adhesive tape material is an adhesive tape material which is made of artificial chemical fibers as a base material, and has strong wear resistance and good elasticity. The slurry storage bag 24 made of the material is not easy to damage during grouting, and can be elastically expanded along with the increase of grouting amount, thereby being beneficial to forming an enlarged head structure.

In some embodiments, the channel is circular or oval in cross-section perpendicular to its axis.

Since the bore hole 1 is generally a circular hole, that is, the section of the bore hole 1 perpendicular to the axis thereof is circular, the shapes of the top plate 21, the bottom plate 22 and the connecting cylinder 23 in the corresponding rear grouting device are matched with each other, that is, the top plate 21 and the bottom plate 22 are circular plates, and the connecting cylinder 23 is a cylindrical cylinder. The first through hole on the top plate 21 and the second through hole on the bottom plate 22 are formed into round holes or elliptical holes, and correspondingly, the hollow cavity of the connecting cylinder 23 is a cylindrical cavity or an elliptical cylindrical cavity. Of course in other embodiments the cross-section of the channel perpendicular to its axis may be of other shapes, such as triangular, rectangular etc., but with a somewhat greater difficulty in processing than circular or oval.

Specifically, as shown in fig. 1 and 2, in this embodiment, the cross section of the channel perpendicular to the axis thereof is circular, and the diameter of the first through hole, the diameter of the second through hole, and the diameter of the circular cross section of the hollow cavity are equal.

In one embodiment, one end of the closed grouting pipe 252 extends into the slurry storage cavity through the top plate 21.

Small holes can be formed in the plate body of the top plate 21 for the closed grouting pipe 252 to pass through, and one end of the closed grouting pipe 252 stretches into the grouting cavity to grouting into the grouting cavity.

In another embodiment, the closed grouting pipe 252 can also penetrate the body of the grouting bag 24 and extend into the grouting cavity, but the sealing is not better than the sealing of the pipe penetrating the top plate 21, so that the penetration of the top plate 21 into the grouting cavity is generally selected.

In one embodiment, one end of the open-type grouting pipe 251 and the closed-type grouting pipe 252 is provided with a check valve 253.

The check valve 253 can prevent the slurry from flowing back, and ensure the slurry to be injected smoothly.

The following describes the construction process of the post-cast-in-place pile using the post-cast-in-place pile composite post-grouting device 2 provided in this embodiment as follows:

first, as shown in fig. 3, a borehole 1 is drilled by a drill or the like according to design requirements.

The post grouting device is then placed at the bottom of the borehole 1 and concrete is poured into the borehole 1 as shown in fig. 4.

As shown in fig. 5, the pile bottom layer is firstly injected with open grouting through the open grouting pipe 251, so that the grout permeates into the soil around the layer. Then, the closed grouting pipe 252 is used for carrying out closed grouting into the grouting space, and the grouting bag 24 expands and extrudes surrounding soil bodies along with the closed grouting. And (3) compacting and solidifying the soil body and the slurry, and finally forming an enlarged head structure at the pile bottom after the slurry and the concrete are coagulated.

Example 2

The difference between the present embodiment and embodiment 1 is that the cross section of the channel perpendicular to the axis thereof is elliptical, and the rest of the structure is the same as that of embodiment 1 and will not be described again.

As shown in fig. 6, the cross section of the channel perpendicular to the axis thereof is elliptical, i.e. the cross sections of the first through hole, the second through hole and the hollow cavity are all elliptical and equal in size.

Example 3

The difference between the present embodiment and embodiment 1 is that the size of the first through hole is smaller than that of the second through hole, and the rest of the structure is the same as that of embodiment 1 and will not be repeated.

Specifically, as shown in fig. 7, the first through hole and the second through hole are circular holes, but the first through hole has a smaller diameter and the second through hole has a larger diameter. The open grouting pipe 251 can pass directly through the bottom plate 22 when being arranged. In other embodiments, the open grouting pipe 251 may be bent to pass through the second through hole.

In another embodiment, the first through hole and the second through hole may be elliptical holes, and the size of the first through hole is still smaller than that of the second through hole.

Example 4

The difference between the present embodiment and embodiment 1 is that the reinforcing component is disposed in the channel, and the rest of the structure is the same as that of embodiment 1 and will not be described again.

Further, in some embodiments, the reinforcement assembly includes a plurality of transverse stiffeners 261 disposed crosswise to the second through hole.

The transverse reinforcement 261 is disposed along a radial direction of the second through hole, and the plurality of transverse reinforcement 261 may be disposed at an included angle intersecting at a center of the second through hole.

In some embodiments, the reinforcement assembly further includes a plurality of vertical stiffeners 262 circumferentially spaced along the channel from the inner wall thereof.

The vertical reinforcement members 262 are disposed parallel to the axial direction of the hollow cavity, i.e., the vertical reinforcement members 262 are parallel to the open grouting tubes 251 and perpendicular to the lateral reinforcement members 261. A plurality of vertical stiffeners 262 may be fixed to the wall surface of the hollow cavity at intervals.

In some embodiments, one end of the vertical reinforcement 262 is connected to one end of the lateral reinforcement 261.

Specifically, as shown in fig. 8, the transverse reinforcement 261 and the vertical reinforcement 262 in this embodiment are both reinforcing bars, and two transverse reinforcements 261 and four vertical reinforcements 262 are provided in total. The two transverse stiffeners 261 are crisscross, and the bottom end of each vertical stiffener 262 is connected with the end of one transverse stiffener 261 in a welding manner.

In other embodiments, the lateral reinforcement 261 and the vertical reinforcement 262 may not be connected, that is, the ends of the lateral reinforcement 261 are directly connected with the bottom plate 22, the vertical reinforcement 262 is connected with the inner wall of the connecting tube 23, and the positions of the ends of the lateral reinforcement 261 and the vertical reinforcement 262 are staggered and not connected.

In other embodiments, the number of the lateral reinforcement 261 and the vertical reinforcement 262 may be adjusted, and the present embodiment is not particularly limited.

Example 5

In this embodiment, as shown in fig. 9 to 11, the post-grouting device 2 for a composite cast-in-place pile can be used in combination with the pile bottom grouting device 3 of patent No. ZL 201980000970.2.

The composite post grouting device 2 of the cast-in-place pile of the embodiment is connected with the pile bottom grouting device 3, the post grouting device is arranged at the upper part, and the pile bottom grouting device 3 is arranged at the lower part. The concrete connection mode can weld the bottom plate 22 of the rear grouting device with the fixed plate 31 of the pile bottom grouting device 3, but the open grouting pipe 251 in the rear grouting device needs to pass through the through hole of the pile bottom grouting device 3 so as to smoothly perform open grouting.

After connection, the whole device is placed at the bottom of the drilling hole 1, and besides open grouting is carried out on the pile bottom stratum through the open grouting pipe 251, closed grouting is carried out in the grouting cavity through the closed grouting pipe 252, and grouting is carried out in the grouting capsule 33 of the pile bottom grouting device 3 through the grouting pipe 32. The enlarged head can be formed around both the rear grouting device and the pile bottom grouting device 3, and finally the enlarged head structure as shown in fig. 11 is formed. The two devices are combined to further enhance the friction resistance and the pulling resistance of the cast-in-place pile.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. The utility model provides a grouting device behind bored concrete pile combined type, sets up in drilling (1) bottom, its characterized in that includes:

A top plate (21), wherein the top plate (21) is provided with a first through hole;

A bottom plate (22), wherein the bottom plate (22) is provided with a second through hole;

The connecting cylinder (23), the connecting cylinder (23) is provided with a hollow cavity with two open ends, the top plate (21) and the bottom plate (22) are respectively arranged at the two ends of the connecting cylinder (23), and the first through hole, the hollow cavity and the second through hole are communicated to form a channel;

The pulp storage bag (24) is arranged on the periphery of the connecting cylinder (23), two ends of the pulp storage bag (24) are respectively connected with the top plate (21) and the bottom plate (22), and the pulp storage bag (24), the top plate (21), the outer wall of the connecting cylinder (23) and the bottom plate (22) form a pulp storage cavity in a surrounding mode;

The grouting assembly comprises an open grouting pipe (251) and a closed grouting pipe (252), wherein the open grouting pipe (251) is arranged in the channel, and one end of the closed grouting pipe (252) stretches into the grouting storage cavity.

2. A bored pile composite post-grouting apparatus as claimed in claim 1, wherein the passageway is circular or elliptical in cross-section perpendicular to its axis.

3. A bored pile composite post-grouting apparatus as defined in claim 2, wherein the first through-hole is smaller in size than the second through-hole.

4. A bored pile composite post-grouting apparatus as claimed in any one of claims 1 to 3, wherein a reinforcing component is provided within the passageway.

5. The post-grouting device of composite pile as claimed in claim 4, characterised in that the reinforcing assembly comprises a plurality of transverse stiffeners (261) arranged crosswise to the second through hole.

6. The post-grouting apparatus as claimed in claim 5, wherein the reinforcing assembly further comprises a plurality of vertical reinforcements (262) provided at intervals along the circumference of the channel on the inner wall thereof.

7. A bored pile composite post-grouting device as claimed in claim 6, characterised in that one end of the vertical reinforcement (262) is connected to one end of the transverse reinforcement (261).

8. A bored pile composite post-grouting device as claimed in claim 1, characterised in that one end of the closed grouting pipe (252) extends into the slurry storage cavity through the top plate (21).

9. The post-grouting device for a composite cast-in-place pile according to claim 1, wherein one end of the open grouting pipe (251) and the closed grouting pipe (252) is provided with a one-way valve (253).

10. The post-grouting device as claimed in claim 1, wherein the storage bag (24) is made of chemical fibre rubberized fabric material.