CN220890190U - Pipe jacking working well - Google Patents

Abstract

The utility model provides a pipe jacking working well, which is applied to the technical construction of open caisson and specifically comprises the following components: a borehole wall, a preformed hole and a plugging member; the well wall surrounds the working well; the reserved hole is arranged on the well wall and is positioned at the lower part of the working well, one side of the reserved hole, which is positioned in the working well, is provided with a reinforcing part, the reinforcing part is arranged along the circumferential direction of the reserved hole, and the reinforcing part is provided with a slot; the plugging piece is detachable inserts and locates in the reinforcing part, and the plugging piece covers the preformed hole in the horizontal direction, wherein, is provided with the backfill layer in the preformed hole. The plugging piece can resist the soil pressure of reserving the entrance to a cave department, and the plugging piece embedding has better stability in the slot simultaneously, can not take place great whole displacement, and when the plugging piece was demolishd, the push bench had already been jacked one section distance, and the backfill layer of push bench front end can realize transient mutual equilibrium with the pressure of soil body, has avoided demolising the back as strutting arrangement's plugging piece, and when the push pipe did not go out of the hole, the soil body gushed into in the working well.

Description

Pipe jacking working well

Technical Field

The utility model relates to the technical field of engineering facilities, in particular to a pipe-jacking working well.

Background

The pipe jacking working well is often constructed by adopting an open caisson technology, and a well wall needs to be reserved with a hole as a hole outlet in the daily pipe jacking construction. The sinking well method is also called as caisson sinking well method, which is to partially sink the whole well wall with the length of 6-7 m in the dead weight at the designed position of the shaft before the soil layer is excavated, and then sink the well wall while tunneling under the shield of the well wall, and correspondingly building the well wall.

In the prior art, the plugging method of the reserved hole of the pipe-jacking working well mainly comprises a bricking method and a steel structure support. The brick laying method is to adopt common bricks to build and seal in the reserved hole, and the brick masonry is chiseled before the jacking pipe is taken out of the hole. The steel structure support is formed by installing a closed steel plate in the reserved hole or outside the reserved hole, the steel plate is connected with the well wall through welding or bolts, and the steel plate and the support are removed before the jacking pipe goes out of the hole.

The plugging device can be detached for jacking pipe construction. In the period of time that the top pipe begins to be constructed after the plugging device is dismantled, the soil outside the reserved hole lacks support because the plugging device is dismantled, the top pipe is not yet constructed, and subsequent support cannot be timely supplemented, so that the soil is gushed into the working well.

Disclosure of utility model

The utility model aims to provide a pipe jacking working well so as to solve the technical problem that soil body floods into the working well due to the fact that a pipe jacking is not yet constructed to go out of a hole after a plugging device is removed in construction of a sunk well technology in the prior art and subsequent support cannot be timely supplemented.

The utility model provides a pipe jacking working well, which is applied to the technical construction of open caissons and specifically comprises the following steps: a borehole wall, a preformed hole and a plugging member; the well wall surrounds a working well; the reserved hole is arranged on the well wall and is positioned at the lower part of the working well, one side of the reserved hole, which is positioned in the working well, is provided with a reinforcing part, the reinforcing part is arranged along the circumferential direction of the reserved hole, and the reinforcing part is provided with a slot; the plugging piece is detachably inserted into the reinforcing part, and covers the reserved hole in the horizontal direction; wherein, be provided with the backfill layer in the preformed hole.

Further, the reinforcement includes a concrete reinforcement layer; the concrete reinforcing layer is circumferentially arranged outside the opening of the reserved hole, and the slot is arranged on the concrete reinforcing layer and the slot opening faces upwards.

Further, the concrete reinforcing layer surrounds to form a plugging hole; and the reserved hole and the plugging hole are internally provided with the backfill layer.

Further, a thixotropic layer is arranged between the plugging piece and the backfill layer; the thixotropic layer is filled with thixotropic colloid.

Further, the colloid in the thixotropic layer is thixotropic slurry.

Further, through holes are formed in the concrete reinforcing layer; the through hole is communicated with the thixotropic layer.

Further, the well wall is of an arc-shaped structure; the working well is a round well; the bottom of the round well is provided with a bottom plate.

Further, one side of the concrete reinforcing layer is attached to the well wall, and the other side of the concrete reinforcing layer is positioned in the working well; the bottom of the concrete reinforcing layer is connected with the bottom plate.

Further, the blocking piece is a steel plate.

Further, a lifting ring is arranged on the steel plate.

The beneficial effects are that:

The pipe jacking working well provided by the utility model is applied to the technical construction of open caisson, and specifically comprises the following components: a borehole wall, a preformed hole and a plugging member; the well wall surrounds the working well; the reserved hole is arranged on the well wall and is positioned at the lower part of the working well, one side of the reserved hole, which is positioned in the working well, is provided with a reinforcing part, the reinforcing part is arranged along the circumferential direction of the reserved hole, and the reinforcing part is provided with a slot; the plugging piece is detachable inserts and locates in the reinforcing part, and the plugging piece covers the preformed hole in the horizontal direction, wherein, is provided with the backfill layer in the preformed hole.

Specifically, the reserved hole is formed in the lower well wall of the well body, the reserved hole is used for the outlet hole of the top pipe in the process of post-jacking construction, the reinforcing part can improve the strength of the reserved hole and fix the plugging piece at the hole of the reserved hole, the plugging piece covers the reserved hole so as to plug the reserved hole, when the well is opened, the soil body in the well is sunk to the designed depth, after the top pipe starts to be constructed, the top pipe machine is pushed into the reserved hole, when the front end of the top pipe machine is away from the plugging piece to a preset distance, the plugging piece is detached from the slot in a pulling-away mode, the top pipe machine continues to work so as to complete the construction of the whole underground pipeline, in the sinking process of the working well, the plugging piece serving as a support can resist the soil pressure at the reserved hole, meanwhile, the plugging piece is embedded into the slot, the stability is good, and large integral displacement can not occur, when the plugging piece is removed, the back-fill layer at the front end of the top machine can be pushed into the designed depth, the back-fill layer and the soil body can be removed from the well as a supporting device after the soil body is removed, and the back-fill layer is not taken into the well as a supporting device, and the soil body is not removed.

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 schematic diagram of a pipe-jacking working well according to an embodiment of the present utility model;

fig. 2 is a schematic top view structure of a pipe-jacking working well according to an embodiment of the present utility model.

Icon:

100-well wall; 110-a working well; 111-a bottom plate;

120-a concrete reinforcing layer; 121-a slot; 122-plugging the hole; 123-through holes;

130-backfill layer; 140-thixotropic layer;

200-reserving holes;

300-plugging piece; 310-lifting ring.

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. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the 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.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model will now be described in further detail with reference to specific examples thereof in connection with the accompanying drawings.

As shown in fig. 1 and 2, the pipe-jacking working well 110 provided in this embodiment is applied to open caisson technology construction, and the specific structure includes a well wall 100, a reserved hole 200 and a plugging member 300. The borehole wall 100 encloses a working well 110. The reserved hole 200 is arranged on the well wall 100 and is positioned at the lower part of the working well 110, one side of the reserved hole 200 positioned in the working well 110 is provided with a reinforcing part, the reinforcing part is arranged along the circumferential direction of the reserved hole 200, and the reinforcing part is provided with a slot 121. The plugging piece 300 is detachably inserted into the reinforcing part, and the plugging piece 300 covers the reserved hole 200 in the horizontal direction, wherein a backfill layer 130 is arranged in the reserved hole 200.

Specifically, in this embodiment, a reserved hole 200 needs to be formed on the lower well wall 100 of the well body, and the reserved hole 200 is used for a hole outlet of a pipe jacking during pipe jacking construction at a later date.

The reinforcing part can improve the strength of the reserved hole 200 and fix the blocking piece 300 at the opening of the reserved hole 200, and the blocking piece 300 covers the reserved hole 200 so as to block the reserved hole 200.

During implementation, the soil body in the well is excavated to enable the working well 110 to sink to the designed depth, after the pipe jacking is started to be constructed, the pipe jacking machine is jacked into the reserved hole 200, when the front end of the pipe jacking machine is away from the plugging piece 300 to a preset distance, the plugging piece 300 is detached from the slot 121 in a drawing-away mode, and the pipe jacking machine continues to work to finish the construction of the whole underground pipeline.

In the sinking process of the working well 110, the plugging piece 300 serving as a support can resist the soil pressure at the opening of the reserved hole 200, meanwhile, the plugging piece 300 is embedded in the slot 121, so that the plugging piece 300 has good stability, and cannot generate large integral displacement.

The backfill layer 130 in this embodiment is a backfill layer, and after the plugging member 300 is inserted into the slot 121, the reserved hole 200 is filled with soil and compacted to form the backfill layer. In the sinking process of the working well 110, the soil around the working well 110 applies pressure to the well wall 100 where the working is performed, the filling soil in the reserved hole 200 is compressed by the pressure of the soil, the structural strength of the backfill layer can be improved, after the plugging piece 300 is disassembled, the backfill layer compacted by the soil can bear the pressure of the soil outside the reserved hole 200 for a short time until the pipe jacking machine is used for jacking the pipe into the reserved hole 200, so that the situation that the pipe jacking is not yet in a hole is avoided, and the soil is just flushed into the working well 110 from the reserved hole 200.

In this embodiment, the reinforcement includes a concrete reinforcement layer 120. The concrete reinforcing layer 120 is circumferentially arranged outside the opening of the reserved hole 200, and the slots 121 are arranged on the concrete reinforcing layer 120 and the slots face upwards.

Specifically, the concrete reinforcing layer 120 in this embodiment is attached to the well wall 100, and the slots 121 are disposed on the concrete reinforcing layer 120, so that the concrete reinforcing layer 120 can improve the structural strength of the opening of the reserved hole 200.

Wherein, notch in this embodiment is located the top of concrete reinforcement layer 120 and the notch orientation is upwards, when setting up shutoff piece 300, inserts the shutoff piece 300 to slot 121 through the notch from top to bottom in, and shutoff piece 300 embedding concrete reinforcement layer 120, and concrete reinforcement layer 120 can also realize spacing to shutoff piece 300 when realizing the structure reinforcing to preformed hole 200, avoids shutoff piece 300 atress back rocking, removal, leads to shutoff piece 300 to deviate from normal position, can't realize the shutoff to preformed hole 200.

In this embodiment, the concrete reinforcing layer 120 surrounds the plugged holes 122. The reserved hole 200 and the plugging hole 122 are provided with a backfill layer 130.

Specifically, the plugging member 300 is inserted into the concrete reinforcing layer 120, and a part of the plugging member 300 is located in the plugging hole 122, and since the backfill layer 130 is disposed in the plugging hole 122, both sides of the plugging member 300 located in the plugging hole 122 are provided with the backfill layer 130. The backfill layer 130 in this embodiment is a backfill layer, after the backfill layer is used to fill the blocked hole 122 and the reserved hole 200, the backfill layer is compacted, the greater the thickness of the backfill layer is, the greater the soil pressure can be balanced, the stress capability of the backfill layer 130 in the blocked hole 122 can be further improved, the phenomenon that the top pipe does not go out of the hole yet is avoided, and the soil is poured into the working well 110 from the reserved hole 200.

In this embodiment, a thixotropic layer 140 is provided between the occluding component 300 and the backfill layer 130. Thixotropic layer 140 is filled with a thixotropic gel.

The thixotropic layer 140 is filled with a thixotropic gel, specifically, in this embodiment, the gel is in a gel or sol state under a standing or shocking condition, and when the plugging member 300 is pulled out from the slot 121, the gel can reduce friction between the plugging member 300 and the well wall 100, maintain the well wall 100, and prevent the well wall 100 from being severely rubbed due to forced pulling out of the plugging member 300, so as to cause collapse or sand gushing of the well wall 100.

In this embodiment, the gel within thixotropic layer 140 is a thixotropic paste.

Thixotropic mud refers to an acid mud that is in a gel or sol state under standing or shock conditions, respectively. In the open caisson process, to reduce frictional resistance between the well wall 100 and surrounding soil, the working well 110 is maintained to prevent collapse and sand gushing. Isolating gushes of water and closing the fissures, and typically pouring thixotropic mud behind the borehole wall 100. The thixotropic slurry in this example is formed by mixing bentonite, water and a chemical treatment agent. The quality and performance of thixotropic slurries affect whether a caisson can successfully sink, and generally require that the thixotropic slurries have good wall protection, thixotropic properties and stability. The thixotropic slurry used herein is effective in reducing the friction between the plug 300 and the backfill layer 130, the plug 300 and the borehole wall 100, and thereby protecting the structure of the backfill layer 130 and the borehole wall 100 from damage due to friction.

In the present embodiment, the concrete reinforcing layer 120 is provided with a through hole 123. The through hole 123 communicates with the thixotropic layer 140.

Because the friction between the plug 300 and the borehole wall 100, the concrete reinforcing layer 120 is small before the plug 300 is inserted, and the backfill layer is required to be disposed after the plug 300 is inserted, the thixotropic layer 140 is not required before the plug 300 is inserted. The through hole 123 in this embodiment is connected to the thixotropic layer 140, and after the plugging member 300 is inserted, and the working well 110 reaches the preset position and the backfill layer is set, the push bench is used to send the push pipe to the hole of the reserved hole 200. When the front end of the push bench reaches the preset position, the plugging member 300 needs to be pulled out, at this time, thixotropic slurry is injected into the thixotropic layer 140 through the through hole 123, so that friction force between the plugging member 300 and the backfill layer, between the concrete reinforcing layer 120 and the well wall 100 is reduced, and then the plugging member 300 can be pulled out, and the front end of the push bench is controlled to move continuously to realize the exit pipe. The thixotropic slurry is injected to reduce friction force when the plugging plate is required to be pulled out, and no colloid exists in the thixotropic layer 140 when the plugging piece 300 is not required to be pulled out, so that friction force between the plugging piece 300 and the concrete reinforcing layer 120 and between the plugging piece 300 and the backfill soil layer is ensured, the position of the plugging piece 300 is not easy to change, shaking and moving of the plugging piece 300 due to stress are avoided, the plugging piece 300 deviates from the original position, and plugging of the reserved hole 200 cannot be realized.

In this embodiment, the well wall 100 has an arc-shaped structure. The working well 110 is a circular well. The bottom of the circular well is provided with a bottom plate 111.

The round well is a common well body in the open caisson technology, the round open caisson is convenient to excavate mechanically, unlike a rectangular well, earth at four corners of the round well is difficult to excavate, the round well is easier to ensure that the cutting edge of the round well is uniformly supported on a soil layer, so that the round well is difficult to incline, and the sinking direction is easier to control.

In this embodiment, one side of the concrete reinforcing layer 120 is attached to the well wall 100 and the other side is located in the working well 110. The bottom of the concrete reinforcing layer 120 is connected to the bottom plate 111.

Specifically, one surface of the concrete reinforcing layer 120 is arc-shaped so as to be attached to the well wall 100, and the bottom surface of the concrete reinforcing layer 120 is abutted against and attached to the upper surface of the bottom plate 111, so that the concrete reinforcing layer 120 is poured, and the connection among the well wall 100, the concrete reinforcing layer 120 and the bottom plate 111 can be realized.

In the present embodiment, the blocking member 300 is a steel plate.

Specifically, the horizontal length of the steel plate is greater than the diameter of the reserved hole 200 by 10 cm to 15cm to ensure that the steel plate can completely cover the opening of the reserved hole 200, in this embodiment, the horizontal length of the steel plate is greater than the diameter of the reserved hole 200 by 10 cm, and the steel plate can completely cover the opening of the reserved hole 200.

In addition, the length of the steel plate in the vertical direction should be greater than the depth of the slot 121 by 3 cm to 5 cm so as to facilitate the drawing of the steel plate from the slot 121, in this embodiment, the length of the steel plate in the vertical direction is greater than the depth of the slot 121 by 5 cm, and when the steel plate is drawn from the slot 121, the steel plate can be drawn through the portion protruding from the slot 121 above the steel plate.

In addition, the slot width of the slot 121 should be greater than the thickness of the steel plate by 2 cm to 3 cm, so that the steel plate can be smoothly inserted into the slot 121, in this embodiment, the slot width of the slot 121 is greater than the thickness of the steel plate by 2 cm, and the steel plate can be smoothly slid into the slot 121 after being placed into the slot opening of the slot 121.

On the other hand, the length of the slot 121 should be longer than the horizontal length of the steel plate so that the steel plate can be stably inserted into the slot 121.

In the present embodiment, a lifting ring 310 is provided on the steel plate.

Specifically, the lifting ring 310 in this embodiment is disposed at the top end of the steel plate, and is an external lifting ring 310, and when the steel plate is inserted into and withdrawn from the lifting ring 310 may be pulled by a crane or the like to pull the steel plate.

As an embodiment, instead of the lifting ring 310 in the present embodiment, a lifting hole penetrating the steel plate may be provided at the top end of the steel plate.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present utility model.

Claims (10)

1. The utility model provides a push pipe work well which characterized in that is applied to open caisson technical construction, includes: the well comprises a well wall (100), a reserved hole (200) and a plugging piece (300);

The well wall (100) surrounds a working well (110);

The reserved hole (200) is arranged on the well wall (100) and is positioned at the lower part of the working well (110), one side of the reserved hole (200) positioned in the working well (110) is provided with a reinforcing part, the reinforcing part is arranged along the circumferential direction of the reserved hole (200), and the reinforcing part is provided with a slot (121);

The plugging piece (300) is detachably inserted into the reinforcing part, and the plugging piece (300) covers the reserved hole (200) in the horizontal direction;

wherein, a backfill layer is arranged in the reserved hole (200).

2. The push pipe work well of claim 1, wherein the reinforcement comprises a concrete reinforcement layer (120);

The concrete reinforcing layer (120) is circumferentially arranged at the outer side of the opening of the reserved hole (200), and the slot (121) is arranged on the concrete reinforcing layer (120) and the slot opening is upwards.

3. A pipe-jacking working well as claimed in claim 2, wherein said concrete reinforcing layer (120) surrounds a plugged hole (122);

The reserved holes (200) and the blocking holes (122) are respectively provided with the backfill layer (130).

4. A pipe-jacking working well as claimed in claim 3, characterized in that a thixotropic layer (140) is provided between the plug (300) and the backfill layer (130);

the thixotropic layer (140) is filled with a thixotropic gel.

5. A push pipe work well according to claim 4, wherein the gel in the thixotropic layer (140) is thixotropic mud.

6. The pipe-jacking working well as claimed in claim 4, wherein the concrete reinforcing layer (120) is provided with through holes (123);

the through hole (123) is in communication with the thixotropic layer (140).

7. A push pipe work well according to claim 2, wherein the well wall (100) is of an arc-shaped configuration;

-the working well (110) is a circular well;

the bottom of the round well is provided with a bottom plate (111).

8. The pipe-jacking working well as claimed in claim 7, wherein one side of said concrete reinforcing layer (120) is attached to said well wall (100) and the other side is located in said working well (110);

The bottom of the concrete reinforcement layer (120) is connected with the bottom plate (111).

9. A push pipe work well according to any of claims 1-8, characterized in that the plug (300) is a steel plate.

10. A pipe-jacking working well as claimed in claim 9, characterized in that the steel plate is provided with lifting rings (310).