CN214944298U

CN214944298U - Pipe jacking assembly

Info

Publication number: CN214944298U
Application number: CN202120292232.4U
Authority: CN
Inventors: 郭成超; 王超杰; 赵威帆; 林振镇; 陆志华; 马兴科; 赵线峰
Original assignee: Henan Research Institute Of Sun Yat Sen University; Zhengzhou University
Current assignee: Henan Research Institute Of Sun Yat Sen University; Zhengzhou University
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-11-30
Anticipated expiration: 2031-02-02

Abstract

The utility model relates to a push pipe subassembly. Push up the pipe subassembly to push up the advancing direction of pipe pushing jack is the fore-and-aft direction, includes: the jacking pipe is formed by sealing and splicing a plurality of jacking pipe sections along the front-back direction; and the grouting pipe extends along the front-back direction and is fixed on the outer wall surface of the top pipe, and a grouting hole is formed in the pipe wall of the grouting pipe. The utility model discloses a with the slip casting pipe setting on the outer wall of push pipe, avoided trompil on the push pipe lateral wall, not only guaranteed the bulk strength of push pipe, guaranteed the sealing performance of push pipe moreover for water in the soil body can not get into to the pipe, is favorable to follow-up work. In addition, the grouting pipe is arranged on the jacking pipe, so that the jacking pipe can be reinforced, and the overall strength of the jacking pipe is further ensured.

Description

Pipe jacking assembly

Technical Field

The utility model relates to a push pipe subassembly.

Background

For underground pipelines crossing buildings and above-ground rivers, the traditional open-cut construction method cannot meet the requirements, and the influence of houses, rivers and the like can be effectively avoided by adopting a pipe-jacking construction method, so that the aim of pipe network arrangement is fulfilled. However, the stratum structure of the pipe jacking construction section is complex, the surrounding soil is mainly silt, silty clay and clay layers, and the underground water is abundant, so that the bearing capacity of the water-rich soft soil layer is insufficient, and the dangerous situations such as settlement and collapse are easily caused. Meanwhile, in the jacking process of the jacking pipe, as the diameter of the end drilling cutter head is larger than that of the jacking pipe, a certain gap exists between the jacking pipe and the surrounding soil body, and the sinking is more easily induced.

Therefore, in order to prevent the adverse effects such as settlement and the like of the jacking pipe in the jacking process of the water-rich soft soil layer, grouting reinforcement is carried out on the jacking pipe by adopting a grouting technology so as to fill gaps around the jacking pipe, improve the bearing capacity of the soil layer near the jacking pipe and ensure normal construction and normal use of later-stage pipelines.

In the prior art, a grouting pipe is generally arranged in a jacking pipe, a grouting hole is machined in the pipe wall of the jacking pipe, one end of the grouting pipe is connected with a grouting pump, the other end of the grouting pipe is connected with the grouting hole, and grout is injected into a gap between the jacking pipe and a soil body through the grouting pipe and the grouting hole. After the lateral wall of the jacking pipe is perforated, the overall strength of the jacking pipe is reduced, and after the construction of the jacking pipe is completed, water in a soil body easily enters the jacking pipe through the grouting hole to influence subsequent work.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a push pipe subassembly to solve among the prior art and lead to the water in the soil body to get into the technical problem in the push pipe lateral wall trompil through the injected hole easily.

In order to achieve the above object, the utility model discloses the technical scheme of push pipe subassembly is:

push up the pipe subassembly to push up the advancing direction of pipe pushing jack is the fore-and-aft direction, includes:

the jacking pipe is formed by sealing and splicing a plurality of jacking pipe sections along the front-back direction;

and the grouting pipe extends in the front-back direction and is welded and fixed on the outer wall surface of the top pipe, and a grouting hole is formed in the pipe wall of the grouting pipe.

The beneficial effects are that: the utility model discloses a with slip casting pipe welded fastening on the outer wall of push pipe, avoided trompil on the push pipe lateral wall, not only guaranteed the bulk strength of push pipe, guaranteed the sealing performance of push pipe moreover for water in the soil body can not get into to the pipe, is favorable to follow-up work. In addition, the grouting pipe is arranged on the jacking pipe, so that the jacking pipe can be reinforced, and the overall strength of the jacking pipe is further ensured.

Furthermore, the slip casting pipe has at least two along the circumference interval arrangement of push pipe, and each slip casting pipe extends to the rear end of push pipe by the front end of push pipe, and the front and back both ends of slip casting pipe are the slip casting entry, and the lumen of slip casting pipe has enclosed construction to separate into two independent slip casting chambeies with the lumen of slip casting pipe.

The beneficial effects are that: the design of appearance, when the slip casting in to the gap between push pipe and the soil body, can be by the front end and the rear end slip casting respectively of slip casting pipe, reduce the longer pressure loss who causes of slip casting pipe, improve and consolidate the quality.

Further, the closed structure is arranged in the middle of the grouting pipe.

The beneficial effects are that: when slip casting through two slip casting inlets slip casting like this, not only avoid slip casting to have great loss of pressure occasionally, can guarantee the homogeneity of whole gap filling moreover.

Furthermore, at least two grouting pipes form a group of grouting pipe groups, and at least two groups of grouting pipe groups are arranged at intervals along the circumferential direction of the top pipe;

each grouting pipe in the same grouting pipe group is arranged at intervals along the circumferential direction of the top pipe, each grouting pipe extends forwards from the rear end of the top pipe, the rear end of each grouting pipe is a grouting inlet, the front end of each grouting pipe is of a closed structure, the length of each grouting pipe is reduced in sequence, and the longest grouting pipe extends from the front end of the top pipe to the rear end of the top pipe;

in same slip casting nest of tubes, the coincidence part of longer slip casting pipe and shorter slip casting pipe does not set up in two adjacent slip casting pipes the injected hole, longer slip casting pipe is provided with the coincidence part of shorter slip casting pipe in two adjacent slip casting pipes the injected hole, and all be equipped with by preceding after to on the shortest slip casting pipe the injected hole.

The beneficial effects are that: by the design, the pipe sections of the grouting pipes with the grouting holes are shorter, pressure loss is avoided, and the reinforcing quality is improved.

Furthermore, the same grouting pipe group comprises at least three grouting pipes, and the length difference of any two adjacent grouting pipes is the same.

The beneficial effects are that: the design is favorable for the uniformity of the slurry in the whole gap, thereby improving the reinforcing quality.

Furthermore, a one-way valve is arranged at the grouting hole.

The beneficial effects are that: the soil body is prevented from blocking the grouting pipe when the grouting pipe is jacked along with the jacking pipe.

Furthermore, the two grouting pipes form a group of grouting pipe groups, and the grouting pipe groups are arranged at least two groups at intervals along the circumferential direction of the top pipe;

two grouting pipes in the same grouting pipe group are arranged at intervals in the front-back direction and are respectively a front grouting pipe and a back grouting pipe;

the front grouting pipe extends backwards from the front end of the top pipe, the front end of the front grouting pipe is a grouting inlet, and the rear end of the front grouting pipe is of a closed structure;

the rear grouting pipe extends forwards from the rear end of the top pipe, the rear end of the rear grouting pipe is a grouting inlet, and the front end of the rear grouting pipe is of a closed structure.

The beneficial effects are that: by the design, when grouting is performed in a gap between the jacking pipe and a soil body, grouting can be performed respectively by the front end and the rear end of the grouting pipe, pressure loss caused by long grouting pipes is reduced, and the reinforcing quality is improved.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the pipe jacking assembly of the present invention before molding;

fig. 2 is a left side view of fig. 1 at the first caisson;

FIG. 3 is a schematic structural view of the post-mold jacking pipe assembly of FIG. 1 after molding for post-mold jacking pipe grouting;

FIG. 4 is a schematic structural view of the pipe jacking assembly of FIG. 1 after being molded, for grouting a front half section of the pipe jacking;

FIG. 5 is a schematic structural view of the pipe jacking assembly of the present invention after molding in embodiment 2;

fig. 6 is a left side view of fig. 5 at the first caisson;

in fig. 1 to 4: 11-a first open caisson; 12-a top pipe section; 13-grouting the pipe section; 14-a cutter head; 15-soil body; 16-a second open caisson; 17-grouting equipment; 18-a slurry conveying pipe; 19-a three-way joint; 20-a gap; 21-jacking pipes; 22-grouting pipe;

in fig. 5 and 6: 23-grouting pipes; 24-a first open caisson; 25-a second open caisson; 26-a gap; 27-grouting equipment; 28-slurry conveying pipe; 29-a three-way joint; 30-soil body; 31-top pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as 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 present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses embodiment 1 of push pipe subassembly:

with the jacking direction of the push bench as the front-rear direction, as shown in fig. 1 to 4, the push bench assembly includes a push bench 21 and grouting pipes 22, the rear end and the front end of the push bench 21 are respectively communicated with the first open caisson 11 and the second open caisson 16, the grouting pipes 22 extend along the front-rear direction and are fixed on the outer wall surface of the push bench 21, six grouting pipes 22 are arranged along the circumferential direction of the push bench 21 at intervals, and each grouting pipe 22 extends from the front end of the push bench 21 to the rear end of the push bench 21. Wherein, the distance between two adjacent grouting pipes 22 in the circumferential direction of the jacking pipe 21 is 0.4-0.6m, preferably 0.52 m.

In this embodiment, the top pipe 21 is formed by welding a plurality of top pipe sections 12 in a sealing manner in the front-rear direction, and the pipe cavity of the top pipe 21 is not communicated with the gap 20, so as to ensure that water in the soil body 15 does not enter the top pipe 21. Wherein, the gap 20 is enclosed by the top pipe 21 and the soil body 15.

In this embodiment, the grouting pipe 22 includes a plurality of grouting pipe sections 13, each grouting pipe section 13 is welded and fixed on the outer side wall of the corresponding top pipe section 12, and two adjacent grouting pipe sections 13 are connected through threads to realize sealing connection, thereby preventing slurry leakage during grouting. Wherein the diameter of the grouting pipe 22 is 2.5 cm.

In this embodiment, the front wall and the rear wall of the grouting pipe 22 are provided with grouting holes, and the grout is injected into the gap 20 through the grouting holes on the grouting pipe 22. In this embodiment, a check valve is disposed at each grouting hole, and the check valve may be a check gate disclosed in application publication No. CN 112096965A. Wherein the distance between two adjacent grouting holes in the front-rear direction is 0.3-0.6m, preferably 0.5 m.

In this embodiment, the front end and the rear end of slip casting pipe 22 are the slip casting entry, and the lumen of slip casting pipe 22 has enclosed construction, and this enclosed construction separates into two independent slip casting chambeies with the lumen of slip casting pipe 22, and two slip casting chambeies communicate with two slip casting entries respectively. Wherein, the closed structure is formed by one end of one grouting pipe section 13 through blind plugging. In other embodiments, one end of one of the grouting pipe sections may be designed as a solid structure, and the solid structure forms a closed structure.

In this embodiment, the sealing structure is located in the middle of the grouting pipe 22, so that when grouting is performed through two grouting inlets, not only is a large pressure loss during grouting avoided, but also the filling uniformity of the whole gap 20 can be ensured. In other embodiments, the closure structure may be disposed at three quarters, two fifths, etc. of the grout tube.

The concrete construction process is as follows:

(1) firstly, welding a plurality of grouting pipe sections 13 arranged at intervals on the outer wall surface of a first top pipe section 12, wherein after the welding is finished, the first top pipe section 12 is pushed forwards along with a cutter head 14 as shown in fig. 1;

(2) after the first top pipe section 12 reaches a preset position, firstly, welding the second top pipe section 12 with the first top pipe section 12, and then, welding a plurality of grouting pipe sections 13 arranged at intervals on the second top pipe section 12, wherein the corresponding grouting pipe sections 13 on the first top pipe section 12 and the second top pipe section 12 are connected through threads;

(3) and (3) repeating the step (2) until the connection of all the top pipe sections 12 and the grouting pipe sections 13 is completed to form the top pipe assembly. When the jacking construction reaches a half stroke, a grouting pipe section 13 with a closed rear end is in threaded connection with a previous grouting pipe section 13 and a next grouting pipe section 13;

(4) as shown in fig. 3, at the first open caisson 11, the second half of the gap is grouted using a grouting apparatus 17. Specifically, the grout in the grouting equipment 17 enters into each grouting pipe 22 through the grout conveying pipe 18, the tee joint 19 and the grouting inlet at the rear end of each grouting pipe 22, and the preferable grouting sequence is that the top is first, the bottom is later and then the middle position is later, so as to complete grouting of the rear half section of the gap 20. Wherein, the remaining end of the three-way joint 19 is connected with a pressure gauge to monitor the pressure change in the grouting process;

(5) as shown in fig. 4, the cutter head 14 is removed, the grouting device 17 is moved to the second open caisson 16, and the grouting device 17 is used to perform grouting on the first half section of the gap, which is the same as the grouting process in step (4).

Because the grouting pressure is too high, the original stratum structure is damaged, the fracturing grouting effect is generated, and the pressure is too low, the effective injection of the grout cannot be ensured, so that the final pressure is controlled to be 2Mpa (can be adjusted according to the actual working condition). And when the grouting pressure reaches 2Mpa, stopping grouting, maintaining pressure, slowly permeating the grout into the formation gap, continuing grouting after 2min until the grout can not be injected completely, and recording the grouting amount.

The utility model discloses embodiment 2 of push pipe subassembly:

taking the jacking direction of the push bench as the front-rear direction, as shown in fig. 5 and 6, the push bench assembly comprises a push bench 31 and a grouting pipe 23, the rear end and the front end of the push bench 31 are respectively communicated with the first open caisson 24 and the second open caisson 25, and the grouting pipe 23 extends along the front-rear direction and is fixed on the outer wall surface of the push bench 31.

In this embodiment, five grouting pipes 23 form a group of grouting pipe groups, and six groups of grouting pipe groups are arranged at intervals along the circumferential direction of the top pipe 31; each grouting pipe 23 in the same grouting pipe group is arranged along the circumferential direction of the top pipe 31 at intervals, each grouting pipe 23 extends forwards from the rear end of the top pipe 31, the length of each grouting pipe 23 is reduced in sequence, the rear end of each grouting pipe 23 is a grouting inlet, and the front end of each grouting pipe 23 is of a closed structure. The longest grouting pipe 23 extends from the front end of the top pipe 31 to the rear end of the top pipe 31.

In this embodiment, in the same grouting pipe group, no grouting hole is provided at the overlapping portion of the longer grouting pipe 23 and the shorter grouting pipe 23 of the two adjacent grouting pipes 23, a grouting hole is provided at the non-overlapping portion of the longer grouting pipe 23 and the shorter grouting pipe 23 of the two adjacent grouting pipes 23, and a grouting hole is provided on the shortest grouting pipe 23 from front to back. Preferably, the length difference of any two adjacent grouting pipes 23 in the same grouting pipe group is the same, so as to ensure the uniformity of grouting.

In this embodiment, a check valve is disposed at each grouting hole, and the check valve may be a check gate disclosed in application publication No. CN 112096965A. Wherein the distance between two adjacent grouting holes in the front-rear direction is 0.3-0.6m, preferably 0.5 m.

In this embodiment, the top pipe 31 is formed by welding a plurality of top pipe sections in a sealing manner in the front-rear direction, and the pipe cavity of the top pipe 31 is not communicated with the gap 26, so as to ensure that water in the soil body 30 does not enter the top pipe 31. Wherein, the gap 26 is enclosed by the top pipe 31 and the soil body 30.

In this embodiment, slip casting pipe 23 includes a plurality of slip casting pipeline sections, and each slip casting pipeline section welded fastening is on the lateral wall of corresponding top pipeline section, and two adjacent slip casting pipeline sections pass through threaded connection to realize sealing connection, the thick liquid is revealed when avoiding the slip casting. Wherein the diameter of the grouting pipe 23 is 2.5 cm.

Taking the distance between the first open caisson 24 and the second open caisson 25 as an example, 100m, every 20m is a reinforced area, and the same reinforced area is grouted by grouting pipes 23 with the same length in 6 grouting pipe groups. If the length of the longest grouting pipe 23 in each grouting pipe group is 100m, the position of the grouting hole of the grouting pipe 23 is 80-100m, the reinforcement area is 80-100m, the length of the next longest grouting pipe 23 in each grouting pipe group is 80m, the position of the grouting hole of the grouting pipe 23 is 60-80m, and the reinforcement area is 60-80 m; and by analogy, the length of the shortest grouting pipe 23 in each grouting pipe group is 20m, the position of the grouting hole of the grouting pipe 23 is 0-20m, and the reinforcement area is 0-20 m.

The longest grouting pipe 23 is used as a first-order grouting pipe, the next longest grouting pipe 23 is used as a second-order grouting pipe, and so on.

The concrete construction process is as follows:

(1) welding a plurality of first-order grouting pipe sections which are arranged at intervals on the outer wall surface of the first top pipe section, wherein the first-order grouting pipe sections are provided with grouting holes, and after welding is finished, the first top pipe section is pushed forwards along with the cutter head;

(2) when the first top pipe section reaches a preset position, the second top pipe section is welded with the first top pipe section, a plurality of first-order grouting pipe sections arranged at intervals are welded on the second top pipe section, and the corresponding first-order grouting pipe sections on the first top pipe section and the second top pipe section are connected through threads. Wherein, when the jacking construction reaches the position of 20m, a non-porous primary grouting pipe section is used for subsequent connection;

(3) when the jacking construction is carried out to 20m, welding a holed second-order grouting pipe section at the side of the holeless first-order grouting pipe until the jacking construction is carried out to 40m, welding a holed second-order grouting pipe section at the side of the holeless first-order grouting pipe, and welding a holed third-order grouting pipe section at the side of the holed second-order grouting pipe section. The rest is done in sequence until a pipe jacking assembly is formed;

(4) grouting is carried out, and the reinforced area at 80-100m is firstly grouted through a grouting pipe. Specifically, the grout in the grouting equipment 27 enters each primary grouting pipe through the grout conveying pipe 28, the tee joint 29 and the grouting inlet of each primary grouting pipe, and the preferable grouting sequence is that the top is arranged firstly, then the bottom is arranged, and then the middle position is arranged, so that the grouting of a reinforced area at a position of 80-100m is completed. Wherein, the remaining end of the three-way joint 29 is connected with a pressure gauge to monitor the pressure change in the grouting process;

(5) and after grouting of the reinforced area at the position of 80-100m is finished, grouting construction of the reinforced areas at the positions of 60-80m, 40-60m, 20-40m and 0-20m is carried out according to the steps.

The utility model discloses embodiment 3 of push pipe subassembly:

the difference between this embodiment and embodiment 1 is that in embodiment 1, a blocking structure is provided at the middle position of each grouting pipe 22, and the blocking structure enables the lumen of each grouting pipe 22 to form two grouting cavities. In this embodiment, two grouting pipes form a group of grouting pipe groups, two grouting pipes in the same grouting pipe group are arranged at intervals in the front-rear direction and are respectively a front grouting pipe and a rear grouting pipe, the front grouting pipe extends backwards from the front end of the top pipe, the front end of the front grouting pipe is a grouting inlet, the rear end of the front grouting pipe is of a closed structure, the rear grouting pipe extends forwards from the rear end of the top pipe, the rear end of the rear grouting pipe is a grouting inlet, and the front end of the rear grouting pipe is of a closed structure.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. Push pipe subassembly, its characterized in that uses push-in direction of push pipe machine as fore-and-aft direction, includes:

2. The push pipe assembly as claimed in claim 1, wherein at least two grouting pipes are arranged at intervals along the circumference of the push pipe, each grouting pipe extends from the front end of the push pipe to the rear end of the push pipe, the front end and the rear end of each grouting pipe are both grouting inlets, and the pipe cavity of each grouting pipe is provided with a closed structure so as to divide the pipe cavity of each grouting pipe into two independent grouting cavities.

3. The push bench assembly of claim 2, wherein the closure is in an intermediate position of the grout tube.

4. The jacking pipe assembly of claim 1, wherein at least two grouting pipes form a group of grouting pipe groups, and the grouting pipe groups are arranged in at least two groups at intervals along the circumference of the jacking pipe;

5. The push bench assembly of claim 4, wherein the same set of grouting pipes comprises at least three grouting pipes, and the difference in length between any two adjacent grouting pipes is the same.

6. A push bench assembly as claimed in any of claims 1-5, wherein a one-way valve is provided at the grouting hole.

7. The jacking pipe assembly according to claim 1, wherein two grouting pipes form a group of grouting pipe groups, and the grouting pipe groups are arranged at intervals along the circumference of the jacking pipe in at least two groups;