阅读说明：本技术 一种管桩桩侧后注浆装置及施工方法 (Tubular pile side-rear grouting device and construction method ) 是由 周蓉峰 高振锋 丁德申 王虓 金毅 贾吉敏 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种管桩桩侧后注浆装置及施工方法,涉及建筑施工技术领域。该管桩桩侧后注浆装置包括钢管桩、多个注浆管件和多个连接件,多个注浆管件环绕钢管桩设置,注浆管件沿钢管桩的长度方向设置,注浆管件开设有注浆口,注浆口用于将注入注浆管件的浆料流出至钢管桩的侧面；多个连接件环绕钢管桩设置并与钢管桩连接,每个连接件与一个注浆管件连接。该管桩桩侧后注浆装置能够提高摩阻力和承载力,便于减小桩长,提高适用范围和降低施工成本。(The invention discloses a tubular pile side-rear grouting device and a construction method, and relates to the technical field of building construction. The pipe pile side rear grouting device comprises a steel pipe pile, a plurality of grouting pipe fittings and a plurality of connecting pieces, wherein the grouting pipe fittings are arranged around the steel pipe pile, the grouting pipe fittings are arranged along the length direction of the steel pipe pile, and are provided with grouting ports which are used for enabling slurry injected into the grouting pipe fittings to flow out to the side face of the steel pipe pile; a plurality of connecting pieces surround the steel-pipe pile and set up and be connected with the steel-pipe pile, and every connecting piece is connected with a slip casting pipe fitting. This slip casting device behind tubular pile stake side can improve frictional resistance and bearing capacity, is convenient for reduce the stake length, improves application scope and reduces construction cost.)

1. The utility model provides a slip casting device behind tubular pile stake side which characterized in that includes:

a steel pipe pile (1);

the grouting pipe fittings (2) are arranged around the steel pipe pile (1), the grouting pipe fittings (2) are arranged along the length direction of the steel pipe pile (1), grouting ports are formed in the grouting pipe fittings (2), and the grouting ports are used for enabling slurry injected into the grouting pipe fittings (2) to flow out to the side face of the steel pipe pile (1);

the connecting pieces (3) are arranged around the steel pipe pile (1) and connected with the steel pipe pile (1), and each connecting piece (3) is connected with one grouting pipe fitting (2).

2. The pile side post grouting device of claim 1, wherein the grouting pipe (2) comprises:

the grouting rigid pipe (21), the said grouting opening is set up on the said grouting rigid pipe (21);

a grouting hose (22), wherein the grouting hose (22) is arranged in the grouting rigid pipe (21) in a penetrating mode.

3. The tubular pile side rear grouting device according to claim 2, wherein the grouting port is opened in a side wall of the grouting rigid pipe (21), and penetrates through the grouting rigid pipe (21) in a length direction of the grouting rigid pipe (21).

4. The tubular pile side rear grouting device according to claim 3, characterized in that one of the grouting pipe fittings (2) can be sleeved on the other.

5. The pile side post grouting device of claim 2, wherein the grouting pipe (2) further comprises:

the grouting rigid pipes (21) are multiple, and two adjacent grouting rigid pipes (21) are connected through the first connecting sleeve;

the grouting hoses (22) are multiple, and two adjacent grouting hoses (22) are connected through the second connecting sleeve.

6. The tubular pile side rear grouting device according to claim 2, wherein the grouting pipe (2) further comprises a fixing member (23), the fixing member (23) is arranged at two ends of the grouting rigid pipe (21), and the fixing member (23) is used for fixing two ends of the grouting hose (22) on the grouting rigid pipe (21).

7. The pile side post grouting device of claim 6, wherein the fixing member (23) comprises:

the cover plate (231), the cover plate (231) is connected to the end of the grouting rigid pipe (21) in a welding mode;

the fixing part (232), fixed part (232) are established on apron (231), fixed part (232) are used for fixing slip casting hose (22).

8. The pile side post grouting device according to claim 7, wherein one of the cover plates (231) includes a tapered plate and closes a bottom end of the grouting rigid pipe (21), and a cross section of the tapered plate is reduced in a direction away from the grouting rigid pipe (21).

9. The tubular pile side rear grouting device according to claim 1, characterized in that two sides of the connecting piece (3) are respectively connected with the steel pipe pile (1) and the grouting pipe fitting (2) in a welding manner.

10. A construction method of a tubular pile side post-grouting device, which adopts the tubular pile side post-grouting device of any one of claims 1 to 9, and is characterized by comprising the following steps:

s1, prefabricating the steel pipe pile (1), the connecting piece (3) and the grouting pipe fitting (2), and transporting to a construction site;

step S2 of welding a plurality of connectors (3) in the circumferential direction of the steel pipe pile (1) along the longitudinal direction of the steel pipe pile (1), and welding the grouting pipe (2) on the connectors (3) along the longitudinal direction of the steel pipe pile (1);

step S3, lifting the post-grouting device at the side of the tubular pile to sink the pile;

s4, after pile sinking is in place, injecting water from the top end of the grouting pipe fitting (2) and performing a water pressing experiment;

step S5, carrying out grouting on the grouting end of grouting equipment and the top end of the grouting pipe fitting (2) together so that slurry enters the bottom end of the grouting pipe fitting (2) and flows out of a grouting opening of the grouting pipe fitting (2) from bottom to top to the outer side of the grouting pipe fitting (2);

and step S6, the slurry flowing out is bonded with the soil body after being solidified.

Technical Field

The invention relates to the technical field of building construction, in particular to a tubular pile side-rear grouting device and a construction method.

Background

In coastal and inland alluvial plain areas, especially in muddy soft soil areas, steel pipe piles, steel sheet piles and the like are usually adopted for part of foundation pits to be used as foundation pit enclosure or engineering piles.

With the continuous development of the process, a novel vibration method pile sinking process of a high-frequency resonance-free method appears in recent years. The high-frequency resonance-free method is a pile sinking process with high work efficiency and low influence, and is applied to a plurality of soft soil areas with silt quality. The high-frequency resonance-free method adopts a vibration hammer for construction, and the working frequency of the vibration hammer is 25-60 Hz. Generally, the low frequency is not more than 15Hz, the medium frequency is 15-20 Hz, the high frequency is 25-60 Hz, the ultrahigh frequency is higher than 60Hz, and the natural vibration frequency of the soil body is generally 15-20 Hz. In order to realize the resonance-free function, the high-frequency resonance-free method adjusts the system eccentric moment of the vibration hammer to zero in the starting and stopping stages without vibration output, and simultaneously enables the vibration hammer to work at high frequency in the pile sinking process so as to avoid resonance.

The resonance-free micro-disturbance steel pipe pile based on the resonance-free hydraulic vibratory hammer process has the requirement of improving the bearing capacity of a single pile under the condition that engineering conditions are limited or the bearing capacity is required to be locally increased. However, the engineering pile in the soft soil area uses the friction pile as the main pile foundation, and the friction pile mainly bears the vertical load acting on the pile top by the friction force generated by the contact of the side surface of the pile and different soil qualities, so that the friction pile is influenced by the length and the diameter of the pile, the design value of the bearing capacity of a single pile is generally 300 tons/root, and sometimes the design requirement cannot be met.

Therefore, a device and a method for grouting a tubular pile at the side of the tubular pile are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a side-rear grouting device for a tubular pile, which can improve the frictional resistance and the bearing capacity, is convenient to reduce the pile length, improves the application range and reduces the construction cost.

The invention also aims to provide a construction method of the tubular pile side rear grouting device, which can improve the frictional resistance and the bearing capacity, facilitate the reduction of the pile length, improve the application range and reduce the construction cost.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

a tubular pile stake side back slip casting device includes: steel pipe piles; the grouting pipe fittings are arranged around the steel pipe pile and are arranged along the length direction of the steel pipe pile, grouting ports are formed in the grouting pipe fittings and are used for enabling slurry injected into the grouting pipe fittings to flow out to the side face of the steel pipe pile; the connecting pieces are arranged around the steel pipe pile and connected with the steel pipe pile, and each connecting piece is connected with one grouting pipe fitting.

Further, the grout pipe comprises: the grouting rigid pipe is provided with a grouting opening; the grouting hose penetrates through the grouting rigid pipe.

Furthermore, the grouting opening is formed in the side wall of the grouting rigid pipe and penetrates through the grouting rigid pipe along the length direction of the grouting rigid pipe.

Further, one of the grouting pipe fittings can be sleeved on the other grouting pipe fitting.

Further, the slip casting pipe further comprises: the grouting rigid pipes are connected through the first connecting sleeve; the grouting hoses are multiple, and two adjacent grouting hoses are connected through the second connecting sleeve.

Furthermore, the grouting pipe fitting further comprises fixing pieces, the fixing pieces are arranged at two ends of the grouting rigid pipe, and the fixing pieces are used for fixing two ends of the grouting hose on the grouting rigid pipe.

Further, the fixing member includes: the cover plate is connected to the end part of the grouting rigid pipe in a welding mode; the fixing part is arranged on the cover plate and used for fixing the grouting hose.

Further, one of the cover plates includes a tapered plate and closes a bottom end of the grouting rigid pipe, and a cross section of the tapered plate is reduced in a direction away from the grouting rigid pipe.

Furthermore, two sides of the connecting piece are respectively connected with the steel pipe pile and the grouting pipe fitting in a welding mode.

A construction method of a tubular pile side rear grouting device adopts the tubular pile side rear grouting device, and comprises the following steps: s1, prefabricating the steel pipe pile, the connecting piece and the grouting pipe fitting, and transporting to a construction site; step S2 of welding a plurality of the connectors in the circumferential direction of the steel pipe pile along the longitudinal direction of the steel pipe pile, and welding the grouted pipe fittings on the connectors along the longitudinal direction of the steel pipe pile; step S3, lifting the post-grouting device at the side of the tubular pile to sink the pile; step S4, after pile sinking is in place, injecting water from the top end of the grouting pipe fitting and performing a water pressing experiment; step S5, carrying out grouting on the grouting end of grouting equipment and the top end of the grouting pipe fitting together, so that slurry enters the bottom end of the grouting pipe fitting and flows out of the grouting opening of the grouting pipe fitting from bottom to top to the outer side of the grouting pipe fitting; and step S6, the discharged slurry is bonded with the soil body after being solidified.

The invention has the beneficial effects that:

according to the pipe pile side rear grouting device provided by the invention, the plurality of grouting pipe fittings are fixedly connected with the steel pipe pile through the connecting pieces, so that the steel pipe pile and the grouting pipe fittings can be conveniently inserted into a soil body at the same time, and the grouting device can be guaranteed to be hammered to a bearing stratum meeting the construction requirement. Meanwhile, as the grouting pipe is provided with the grouting opening, after the end part of the grouting pipe is injected with slurry through the grouting equipment, the slurry firstly flows into the bottom end from the top end of the grouting pipe, then slowly leaks out from the bottom end to the top through the grouting opening, and is filled between the outer side of the grouting pipe and a soil body, so that the slurry plays roles of permeating, filling, compacting and solidifying layer by layer on the soil on the side wall of the grouting device, the bearing capacity is improved, and the construction cost is reduced. Meanwhile, the grouting pipe fitting is connected with the steel pipe pile through the connecting piece, so that the contact area of the steel pipe pile and a soil body can be effectively increased, the frictional resistance and the bearing capacity are further improved, and the pile length is convenient to reduce and the construction cost is reduced. In addition, because the steel-pipe pile outside is provided with a plurality of slip casting pipe fittings around to can all flow out in the outside of steel-pipe pile everywhere and have the thick liquids so that the soil layer on the global of steel-pipe pile all has the thick liquids to play the effect of infiltration, packing, compaction and consolidation, guarantee whole slip casting device's vertical resistance to compression bearing capacity betterly, realized reducing the long and reduction construction cost's of stake purpose.

According to the construction method of the prestressed concrete pipe pile, the pipe pile side rear grouting device is arranged, so that the gap between the steel pipe pile and the soil body can be effectively filled in the length direction of the steel pipe pile, and meanwhile, the connecting piece can further improve the contact area of the slurry and the soil body, so that the frictional resistance and the bearing capacity are effectively improved, the construction effect is better improved, the pile length is further convenient to reduce, and the construction cost is reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a pipe pile side post grouting device provided by an embodiment of the invention;

FIG. 2 is a schematic view of a portion of the enlarged structure at A in FIG. 1;

FIG. 3 is a schematic diagram of the internal structure of a pipe pile side post-grouting device provided by an embodiment of the invention;

fig. 4 is a flowchart of a construction method of a pipe pile side post-grouting apparatus according to an embodiment of the present invention.

Reference numerals

1. Steel pipe piles;

2. grouting the pipe fitting; 21. grouting a rigid pipe; 22. grouting a hose; 23. a fixing member; 231. a cover plate; 232. a fixed part;

3. a connecting member.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The specific structure of the pile side rear grouting device according to the embodiment of the present invention will be described with reference to fig. 1 to 3.

As shown in fig. 1-3, fig. 1 discloses a pipe pile side back grouting device, which comprises a steel pipe pile 1, a plurality of grouting pipe fittings 2 and a plurality of connectors 3. A plurality of slip casting pipe fittings 2 encircle steel-pipe pile 1 and set up, and slip casting pipe fittings 2 have seted up the slip casting mouth along the length direction setting of steel-pipe pile 1, and the slip casting mouth is used for flowing into the thick liquids of slip casting pipe fittings 2 to the side of steel-pipe pile 1. A plurality of connecting pieces 3 encircle steel-pipe pile 1 and set up and be connected with steel-pipe pile 1, and every connecting piece 3 is connected with a slip casting pipe fitting 2.

It can be understood that a plurality of slip casting pipe fittings 2 pass through connecting piece 3 and 1 fixed connection of steel-pipe pile to be convenient for insert the soil body with steel-pipe pile 1 and slip casting pipe fitting 2 simultaneously, and can guarantee to beat the slip casting device to the holding power layer that accords with the construction requirement. Meanwhile, as the grouting pipe fitting 2 is provided with the grouting opening, after the end part of the grouting pipe fitting 2 is injected with slurry through grouting equipment, the slurry firstly flows into the bottom end from the top end of the grouting pipe fitting 2, then slowly leaks out from the bottom end to the top through the grouting opening, and is filled between the outer side of the grouting pipe fitting 2 and a soil body, so that the slurry plays roles of permeation, filling, compaction and consolidation on a soil layer on the circumferential direction of the side wall of the grouting device, the bearing capacity is improved, and the construction cost is reduced. Meanwhile, the grouting pipe fitting 2 is connected with the steel pipe pile 1 through the connecting piece 3, so that the contact area between the steel pipe pile 1 and a soil body can be effectively increased, the frictional resistance and the bearing capacity are further improved, and the pile length is conveniently reduced and the construction cost is reduced. In addition, because 1 outside of steel-pipe pile is encircleed and is provided with a plurality of slip casting pipe fittings 2, thereby can all flow out everywhere in the outside of steel-pipe pile 1 and have the thick liquids, thereby make the soil layer on 1 global of steel-pipe pile all have the thick liquids to play the effect of infiltration, packing, compaction and consolidation, with the vertical resistance to compression bearing capacity who has guaranteed whole slip casting device betterly, be convenient for realize reducing the long and purpose that reduces construction cost of stake.

Specifically, in this embodiment, the slurry output by the grouting device is cement slurry, the fluidity of the cement slurry is good, the cement slurry can smoothly flow into the gap between the pile side and the soil body on the pile side, and the cement slurry has a certain strength after being solidified, and can solidify the soil layers on the pile side and the circumferential direction of the grouting device.

Specifically, in this embodiment, the connecting member 3 is a connecting plate, and the thickness of the connecting plate is preferably 6mm, which not only facilitates the implementation of the welding connection with the steel pipe pile 1 and the grouting iron pipe, but also increases the contact area between the steel pipe pile 1 and the soil body, and improves the frictional resistance and the bearing capacity, thereby facilitating the reduction of the pile length and the construction cost.

Specifically, in the present embodiment, the diameter of the steel pipe pile 1 is 700mm, and the outer diameter of the grouting pipe 2 is 60 mm.

Specifically, in the present embodiment, as shown in fig. 3, a plurality of grouting pipes 2 are uniformly distributed in the circumferential direction of the steel pipe pile 1, and the number thereof may be three, four or more, and need not be particularly limited.

In some embodiments, the grouting pipe member 2 includes a grouting rigid pipe 21 and a grouting hose 22. The grouting port is opened in the grouting rigid tube 21. A grouting hose 22 is arranged in the grouting rigid pipe 21 in a penetrating mode.

It can be understood that the grouting rigid pipe 21 not only facilitates stable insertion into soil during pile sinking, but also can play a better protection role for the grouting hose 22 during pile sinking, and can prevent soil from entering the grouting rigid pipe 21 through the length of the grouting rigid pipe not less than that of the steel pipe pile 1, so as to facilitate subsequent grouting through the grouting opening and the grouting hose 22.

Specifically, the outer diameter of the grouting rigid pipe 21 is 60mm, and the outer diameter of the grouting hose 22 is 45 mm.

In some embodiments, as shown in fig. 1-3, the grouting port is opened on a side wall of the grouting rigid pipe 21 and penetrates the grouting rigid pipe 21 along the length direction of the grouting rigid pipe 21.

It can be understood that, because the slip casting rigid pipe 21 is run through along the length direction of slip casting rigid pipe 21 to the slip casting mouth, make the soil body be difficult to stop up the slip casting mouth completely, the whole area of slip casting mouth has effectively been improved simultaneously, be favorable to improving by the volume of the slip casting mouth slip casting to the steel-pipe pile 1 outside, guaranteed better all filling reliable thick liquids everywhere on the length direction of steel-pipe pile 1, it has abundant integration to guarantee that pile body everywhere homoenergetic and soil body, thereby further improved frictional resistance, improve the bearing capacity, be favorable to reducing the pile length and reduce construction cost.

Of course, in other embodiments of the present invention, according to actual requirements, a plurality of grouting holes may be formed in the side wall of the grouting rigid pipe 21, and the plurality of grouting holes form a grouting opening, which also has the effect of grouting out slurry. However, the grouting opening penetrating along the length direction of the grouting rigid pipe 21 of the embodiment can greatly reduce the problem that the grouting hole is blocked by soil, thereby effectively improving the outflow and filling effects of the slurry.

In some embodiments, one of the plurality of grouting pipes 2 can be sleeved on another.

It can be understood that, because the grouting opening runs through along the length direction of the grouting rigid pipe 21, the connecting piece 3 can pass through the grouting rigid pipe 21, and then the outer diameter of the grouting rigid pipe 21 of one grouting device can be set to be smaller than the inner diameter of the grouting rigid pipe 21 of another grouting device, so that one of the grouting pipe fittings 2 can be sleeved on the other grouting pipe. Through the structure, a plurality of grouting devices can be sequentially connected through the grouting pipe fittings 2, and then a grouting hose 22 is arranged in two grouting rigid pipes 21 of two adjacent grouting devices, so that grouting can be injected, and the plurality of grouting devices form a steel pipe enclosure system without gaps, so that the effect of water stopping and soil retaining pressure supporting is achieved, and the application range of the grouting devices is effectively enlarged.

In some embodiments, as shown in fig. 2 and 3, the grouting pipe 2 further comprises a first connection sleeve and a second connection sleeve. The grouting rigid pipes 21 are multiple, and two adjacent grouting rigid pipes 21 are connected through a first connecting sleeve. The grouting hose 22 is plural, and two adjacent grouting hoses 22 are connected by a second connection sleeve.

It can be understood that, in some construction occasions, the processing difficulty of the overlong grouting rigid pipe 21 or grouting hose 22 is large, so that a plurality of grouting rigid pipes 21 and a plurality of grouting hoses 22 need to be arranged, which can facilitate reducing the processing cost and further reduce the construction cost. The first connecting sleeve is connected with the two adjacent grouting rigid pipes 21, so that firm connection of the grouting rigid pipes 21 can be well guaranteed, and the rigidity and the strength of the grouting rigid pipes 21 can meet requirements. The two adjacent grouting hoses 22 are connected through the second connecting sleeve, so that the sealing performance of the joint of the two adjacent grouting hoses 22 can be better ensured, the water leakage or slurry leakage problem is reduced, and the grouting reliability is ensured.

Of course, in other embodiments of the present invention, only one grouting rigid pipe 21 and grouting flexible pipe 22 may be selected, and the specific number thereof may be determined according to actual requirements.

Specifically, in the present embodiment, the number of the grouting rigid pipes 21 and the grouting flexible pipes 22 may be three, four, five, or the like, or may be only two, and the specific number thereof may be determined according to actual construction requirements, and need not be specifically limited herein.

In some embodiments, as shown in fig. 1 and 2, the grouting pipe member 2 further includes a fixing member 23, the fixing member 23 is disposed at both ends of the grouting rigid pipe 21, and the fixing member 23 is used for fixing both ends of the grouting hose 22 to the grouting rigid pipe 21.

It can be understood that, mounting 23 can firmly fix slip casting hose 22's both ends on slip casting rigid pipe 21, thereby better realized slip casting hose 22 and slip casting rigid pipe 21's fixed connection, make the thick liquids from bottom to top not cause negative effects to the installation of slip casting hose 22 in slip casting rigid pipe 21 when flowing through the slip casting mouth, thereby be favorable to improving stability and reliability when pouring into the thick liquids through slip casting hose 22, and then guaranteed better all over to all fill reliable thick liquids in the length direction of steel-pipe pile 1, in order to ensure that pile body everywhere homoenergetic has abundant integration with the soil body, thereby further improved frictional resistance, improve the bearing capacity, be favorable to reducing the pile length and reduce construction cost.

Specifically, in this embodiment, the grouting rigid pipe 21 includes a grouting steel pipe or a grouting iron pipe, and the specific material of the grouting rigid pipe 21 may be determined according to actual requirements without specific limitations.

In some embodiments, as shown in fig. 2, the fixing member 23 includes a cover plate 231 and a fixing portion 232. Cover plate 231 is welded to the end of grouted rigid pipe 21. The fixing portion 232 is provided on the cover plate 231, and the fixing portion 232 is used for fixing the grouting hose 22.

It can be understood that the cover plate 231 at the bottom end of the grouting rigid pipe 21 can prevent soil from entering the grouting rigid pipe 21 and extruding the grouting hose 22 during installation of the grouting device, so that the grouting hose 22 is well protected, the service life of the grouting hose 22 is prolonged, the probability of grouting failure is reduced, and subsequent grouting operation is facilitated. The fixing portion 232 can fix the grouting hose 22 well, so that both ends of the grouting hose 22 can be fixed to both ends of the grouting rigid pipe 21, and the stability of the grouting hose 22 is guaranteed well.

Specifically, in this embodiment, the retainer 232 includes a hook that is capable of engaging with a loop structure on the grout hose 22 and providing a secure connection of the grout hose 22 to the retainer 232. In other embodiments of the present invention, the fixing portion 232 may be disposed on the grouting hose 22, and the fixing portion 232 is further fixedly connected to the cover plate 231, and the specific structure of the fixing portion 232 may be determined according to actual requirements, as long as the end of the grouting hose 22 can be firmly connected, and no specific limitation is required.

Specifically, in the present embodiment, the circumferential surface of the cover plate 231 and the end of the grouting rigid pipe 21 are welded, and the connection is firm and reliable, is not easily deformed, and has excellent sealing performance.

Specifically, in the present embodiment, the cover plate 231 disposed at the top end of the grouting rigid pipe 21 is opened with a through hole, so that the grouting equipment can communicate with the grouting hose 22 through the through hole and realize grouting.

In some embodiments, as shown in fig. 2, the cover plate 231 at the bottom end of the grouting rigid pipe 21 comprises a tapered plate to close the bottom end of the grouting rigid pipe 21, and the cross section of the tapered plate decreases in a direction away from the grouting rigid pipe 21.

It can be understood that, because the section of the conical plate is reduced in the direction departing from the grouting rigid pipe 21, the conical plate can play a role in guiding the grouting device in the pile sinking process in the soil body, and the resistance of the grouting device inserted into the soil body is effectively reduced, so that the pile sinking process is more labor-saving.

Alternatively, in other embodiments of the present invention, a similar guiding structure may be provided at the end of the steel pipe pile 1, which may further improve pile sinking convenience.

In some embodiments, two sides of the connector 3 are welded to the steel pipe pile 1 and the grouting pipe 2, respectively.

It can be understood that the welding connection is firm and reliable, and the grouting pipe fitting 2 can be prevented from being separated from the steel pipe pile 1 in the pile sinking process, so that the use quality of the grouting device is better ensured. In addition, because the global of steel-pipe pile 1 and slip casting pipe fitting 2 is the cambered surface, be difficult for being connected with connecting piece 3 through connection structure, welded connection also can effectively reduce grouting device's the processing degree of difficulty.

As shown in fig. 4, the invention also discloses a construction method of the tubular pile side back grouting device, which adopts the tubular pile side back grouting device, and comprises the following steps:

step S1, prefabricating the steel pipe pile 1, the connecting piece 3 and the grouting pipe fitting 2, and transporting to a construction site;

step S2, welding a plurality of connectors 3 in the circumferential direction of the steel pipe pile 1 along the length direction of the steel pipe pile 1, and welding a grouting pipe fitting 2 on the connectors 3 along the length direction of the steel pipe pile 1;

referring to fig. 1-3, during connection, welding of the grouting rigid pipe 21 along the length direction of the steel pipe pile 1 is ensured, a grouting opening is arranged away from the steel pipe pile 1, and meanwhile, both ends of the grouting hose 22 and both ends of the grouting rigid pipe 21 are firmly connected through fixing pieces 23;

step S3, hoisting the pile side rear grouting device of the tubular pile, and sinking the pile;

before pile sinking, a construction site is filled and leveled, drainage work is well done, and before pile sinking, a length mark can be drawn on one side of each tubular pile structure by using red lead oil so as to display the soil penetration depth of the tubular pile structure during pile sinking;

after the pile hammer presses the pile top, whether the center line of the pile hammer and the center line of the pipe pile structure are in the same vertical axis and whether the verticality and the inclination of the pipe pile structure meet the requirements or not must be checked;

in the pile driving process, whether a pile hammer and a pile body and a pile cap of the tubular pile structure are positioned on the same axis or not is monitored constantly, meanwhile, the verticality of the tubular pile structure is strictly controlled, and the deviation rectification cannot be realized by adopting methods such as jacking and pulling the pile body;

step S4, after pile sinking is in place, injecting water from the top end of the grouting pipe fitting 2 and performing a water pressing experiment;

specifically, high-pressure water is injected through a nozzle at the top end of the grouting hose 22 to check the smoothness among the plurality of grouting hoses 22 inside;

step S5, grouting the grouting end of the grouting equipment and the top end of the grouting pipe fitting 2 together, so that slurry enters the bottom end of the grouting pipe fitting 2 and flows out of the grouting pipe fitting 2 from bottom to top from a grouting port of the grouting pipe fitting 2;

that is to say, in this embodiment, the grouting equipment injects the slurry into the bottom end of the grouting rigid pipe 21 through the top end of the grouting hose 22, the slurry injected into the bottom end of the grouting rigid pipe 21 can flow out to between the side wall of the steel pipe pile 1 and the soil body along the grouting opening, and as the slurry is continuously injected, the slurry flowing out from the grouting opening will gradually increase from bottom to top, thereby ensuring that the slurry is provided on the outer sides of the lower part, the middle part and the upper part of the steel pipe pile 1.

And step S6, the discharged slurry is bonded with the soil body after being solidified.

According to the construction method of the tubular pile side post-grouting device provided by the embodiment of the invention, due to the tubular pile side post-grouting device, the gap between the steel pipe pile 1 and the soil body can be effectively filled in the length direction of the steel pipe pile 1, and meanwhile, the connecting piece 3 can further improve the contact area of slurry and the soil body, so that the frictional resistance and the bearing capacity are effectively improved, the construction effect is better improved, the pile length is further convenient to reduce, and the construction cost is reduced.

In some embodiments, the grouting is symmetrical grouting, the grouting pressure is 3.8-4.2 MPa, preferably 4MPa, and the grouting filling coefficient is 1.1-1.3, preferably 1.2. The symmetric grouting can better guarantee the grouting effect, and the grouting and grouting filling coefficients can meet the requirement of grouting after full length, so that the grouting effect is further guaranteed, and the grouting can be fully grouted between the lower part, the middle part and the upper part of the steel pipe pile 1 and a soil body.

In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.