End water stop reinforcing structure for jacking pipe

Abstract

The utility model relates to an end water-stopping reinforcing structure for a jacking pipe, a working well is arranged at the end of the jacking pipe, and the end water-stopping reinforcing structure comprises water-stopping reinforcing systems which are respectively arranged on the front side and the rear side of the working well and are suitable for water-stopping reinforcing of the working well; the water stop reinforcing system comprises a water stop curtain, a plurality of stirring piles, a plurality of MJS piles and a plurality of joint MJS piles, the water stop curtain is located on the front side of the working well, the two ends of the water stop curtain are connected with the two sides of the working well correspondingly, the stirring piles and the MJS piles are sequentially arranged between the water stop curtain and the working well, and the joint MJS piles are arranged at the joint of the water stop curtain and the working well; a plurality of stirring piles are arranged behind the working well. The waterproof curtain of the reinforcing structure surrounds the whole front end part of the working well, and the bottom end part of the waterproof curtain extends into a rock stratum, so that effective water stopping and reinforcing can be carried out; the waterproof curtain, the stirring piles and the MJS piles are used for conducting multiple waterproof reinforcement on the working well, the risk of water seepage and water leakage is avoided, and the waterproof reinforcement effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe jacking, and relates to the water stop at the end of pipe jacking, in particular to a water stop and reinforcement structure for the end of pipe jacking. Background Technique

[0002] With the acceleration of the urbanization process, the underground tunnels are constantly developing. The construction of underground tunnels includes open cut method, mined tunneling method, etc. When some tunnel routes need to penetrate important structures, the large-section rectangular pipe jacking method is usually used for construction. At present, most of the domestic rectangular pipe jacking construction strata are relatively good geological strata such as silty clay or silty clay. For the end reinforcement construction of large-section rectangular pipe jacking in strong permeable strata such as sand layer and gravel layer, the following problems exist:

[0003] 1. The traditional construction methods of three-axis cement mixing piles and sleeve valve pipe grouting reinforcement have poor reinforcement effects, cannot effectively carry out water stop and reinforcement, and there are risks of sudden gushing and water leakage, which affect the construction period and the construction quality is poor;

[0004] 2. The high-pressure jet grouting pile reinforcement has a large disturbance to the surrounding soil, which is easy to cause soil deformation. When the end of the large-section rectangular pipe jacking is close to key hydraulic structures such as dams, the influence is great and it is not conducive to the stability of the original structure.

[0005] Therefore, we propose a water stop and reinforcement structure for the end of pipe jacking to solve the above problems. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a water stop and reinforcement structure for the end of pipe jacking with good water stop performance and low disturbance.

[0007] To solve the above problems, the technical solution of the utility model is as follows:

[0008] A water stop and reinforcement structure for the end of pipe jacking, a working well is arranged at the end position of the pipe jacking, including:

[0009] A water stop and reinforcement system, which is respectively arranged on the front and rear sides of the working well and is suitable for water stop and reinforcement of the working well;

[0010] The water stop and reinforcement system includes a water stop curtain, a number of mixing piles, a number of MJS piles and a number of joint MJS piles. The water stop curtain is located on the front side of the working well, and both ends of the water stop curtain are respectively connected to both sides of the working well. A number of mixing piles and a number of MJS piles are sequentially arranged between the water stop curtain and the working well, and a number of joint MJS piles are arranged at the connection position between the water stop curtain and the working well;

[0011] A number of mixing piles are arranged on the rear side of the working well.

[0012] In a further embodiment, a partition is provided in the middle of the water-stop curtain. One end of the partition is connected to the water-stop curtain, and the other end of the partition is connected to the working well.

[0013] In a further embodiment, a number of MJS piles are provided below the mixing piles on the front side of the working well.

[0014] In a further embodiment, the water-stop reinforcement system further includes an internal dewatering well and an external dewatering well. A number of external dewatering wells are arranged at intervals on the outer side of the water-stop curtain, and a number of internal dewatering wells are arranged at intervals on the inner side of the water-stop curtain. A number of internal dewatering wells are all located on both sides of the mixing piles within the water-stop curtain.

[0015] In a further embodiment, the vertical section of the water-stop curtain is an L-shaped structure, and the bottom of the water-stop curtain is located below the mixing piles, MJS piles and joint MJS piles.

[0016] In a further embodiment, the water-stop curtain is a C-shaped structure, and a set of joint MJS piles are arranged on both the inner and outer sides of the position where the water-stop curtain is connected to the working well.

[0017] In a further embodiment, adjacent MJS piles and adjacent joint MJS piles are all arranged in an interlocking manner.

[0018] In a further embodiment, the mixing piles are triaxial cement mixing piles.

[0019] In a further embodiment, the water-stop curtain is an equal-thickness cement-soil mixing continuous wall.

[0020] In a further embodiment, the number of a set of joint MJS piles is nine.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] 1. In the present reinforcement structure, a water-stop curtain is provided on the front side of the working well to surround the entire front end of the working well. The bottom end of the water-stop curtain extends into the rock formation, and effective water-stop reinforcement can be carried out. Mixing piles and MJS piles are sequentially arranged between the water-stop curtain and the working well, joint MJS piles are arranged at the position where the water-stop curtain is connected to the working well, and mixing piles are arranged at the rear side of the working well to perform multiple water-stop reinforcements on the working well, avoiding the risk of seepage and water leakage, and improving the water-stop reinforcement effect.

[0023] 2. The present reinforcement structure adopts a reinforcement method combining a water-stop curtain, mixing piles and MJS piles. While ensuring the water-stop reinforcement effect, it can minimize the disturbance to the soil mass to the greatest extent, reduce the impact on the surrounding original structures, and has good construction effects.

[0024] 3. In the construction of MJS piles in the highly pervious layer for this reinforcement structure, compared with other processes, MJS piles have better pile-forming quality, improve the reinforcement effect of the highly pervious layer, ensure that there is no water gushing at the bottom after the pipe jacking, and have good water-stop effect.

[0025] 4. A partition is set in the middle of the water-stop curtain for this reinforcement structure. One end of the partition is connected to the water-stop curtain, and the other end is connected to the working well, dividing the front side of the working well into two parts, so that the water-stop on one side of the working well is not damaged after single-width pipe jacking on one side, and groundwater can also be effectively isolated during the construction process to ensure the water-stop quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a top view of a head water-stop reinforcement structure for pipe jacking;

[0027] Figure 2 It is a side view of a head water-stop reinforcement structure for pipe jacking.

[0028] In the figure: 1. Working well; 2. Water-stop reinforcement system; 21. Water-stop curtain; 211. Partition; 22. Mixing pile; 23. MJS pile; 24. Inner dewatering well; 25. Outer dewatering well; 26. Joint MJS pile; X. Jacking direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] Embodiment 1:

[0031] A head water-stop reinforcement structure for pipe jacking, such as Figure 1 、 Figure 2As shown, a water-stopping reinforcement system 2 is respectively arranged at the front and rear sides of the working well 1 located at the end of the jacking pipe, for water-stopping reinforcement of the working well 1; the water-stopping reinforcement system 2 includes a water-stopping curtain 21, a mixing pile 22, an MJS pile 23 (i.e., an all-round high-pressure jet pile) and a joint MJS pile 26. Along the jacking direction X, a water-stopping curtain 21 is arranged at the front side of the working well 1. The water-stopping curtain 21 adopts a TRD cement-soil mixing wall (i.e., an equal-thickness cement-soil mixing continuous wall) with a cement content of 25%. The top end of the water-stopping curtain 21 is located at the ground, and the bottom end passes through the highly permeable layer and extends into the medium-weathered rock layer by 1 meter, with a thickness of 0.8 meters; the water-stopping curtain 21 is a C-shaped structure, and the two end parts of the water-stopping curtain 21 The two sides of the working well 1 are connected separately. A mixing pile 22 is set between the water-stop curtain 21 and the working well 1. The mixing pile 22 is a three-axis cement mixing pile with a diameter of 850 mm and a cement content of 20%. The distance between adjacent mixing piles 22 is 600 mm. The top end of the mixing pile 22 is located on the ground, and the bottom end is located at the bottom of the top pipe; an MJS pile 23 is set below the mixing pile 22. The cement content of the MJS pile 23 is 40%, and the diameter is 2 meters. The distance between the pile cores of two adjacent MJS piles 23 is 1 meter. The full-hall reinforcement method is adopted. The plane range of the reinforcement area is the same as that of the mixing pile 22. The top end of the MJS pile 23 is located at the bottom of the top pipe and the bottom end of the mixing pile 22. The bottom end of 3 is located at the bottom of the highly permeable layer; the vertical section of the water-stop curtain 21 is an L-shaped structure, and the bottom of the water-stop curtain 21 is located below the MJS pile 23; a row of MJS piles 23 is arranged between the mixing piles 22 and the working well 1, and adjacent MJS piles 23 are interlocked with each other. The MJS piles 23 located between the mixing piles 22 and the working well 1 are also located above the bottom of the water-stop curtain 21, and the top end of the MJS pile 23 is located on the ground, and the bottom end is located at the bottom of the highly permeable layer; a plurality of joint MJS piles 26 are arranged on both sides of both ends of the water-stop curtain 21, and adjacent joint MJS piles 26 are interlocked with each other, which are used to reinforce the joint between the water-stop curtain 21 and the working well 1. The cement content is 40%, the diameter is 2 meters, the pile center spacing between two adjacent joint MJS piles 26 is 1 meter, and nine joint MJS piles 26 are arranged on the inner and outer sides of one end of the water-stop curtain 21, and the top end of the joint MJS pile 26 is located at the ground, and the bottom end is located at the bottom of the strong permeable layer; along the jacking direction X, a mixing pile 22 is arranged on the rear side of the working well 1. The mixing pile 22 adopts a three-axis cement-soil mixing pile with a diameter of 850 mm and a cement content of 25%. The pile center spacing between adjacent mixing piles 22 is 600 mm, and the top end of the mixing pile 22 is located at the ground, and the bottom end is located at the bottom of the foundation pit; it is used to waterproof and reinforce the soil on the rear side of the working well 1 and improve the jacking efficiency of the jacking pipe.

[0032] like Figure 1 , Figure 2As shown in the figure, a partition 211 is provided in the middle of the water-stop curtain 21. One end of the partition 211 is connected to the water-stop curtain 21, and the other end of the partition 211 is connected to the working well 1. The water-stop curtain 21 is divided into two parts by the partition 211, so that the single-journey jacking construction on one side of the working well 1 does not damage the water-stop reinforcement on the other side of the working well 1, effectively isolating groundwater; several external dewatering wells 25 are arranged at intervals outside the water-stop curtain 21, and the positions of the several external dewatering wells 25 are determined according to the requirements of the construction site; three internal dewatering wells 24 are arranged at intervals between the inner side of the water-stop curtain 21 and both sides of the mixing piles 22. The internal dewatering wells 24 and the external dewatering wells 25 are made of seamless steel pipes, and several round holes are made at the bottom as filter holes. The top ends of the internal dewatering wells 24 and the external dewatering wells 25 are both located at the ground level, and the bottom ends are both located 8 meters below the bottom of the jacking pipe. Before the jacking pipe is jacked, the water level in the internal dewatering well 24 is lowered to 2 meters below the elevation of the bottom of the jacking pipe to ensure the water-stop effect.

[0033] The construction steps of the present utility model are as follows: First, the working well 1 is constructed. After the construction is completed, the water-stop curtain 21 is constructed by a channel cutter. Then, the mixing piles 22 and the MJS piles 23 located in front of the working well 1 are constructed for soil reinforcement. Then, the joint MJS piles 26 are constructed at the joint position between the water-stop curtain 21 and the working well 1.

[0034] After the reinforcement construction is completed, the internal dewatering wells 24 are constructed to dewater the interior of the reinforcement area. Then, the external dewatering wells 25 are constructed to reduce the water pressure around the reinforcement area. Finally, the mixing piles 22 located behind the working well 1 are constructed.

[0035] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waterproof reinforcement structure for the end of a jacking pipe, wherein a working well (1) is provided at the end of the jacking pipe, characterized in that: include: A water-stopping reinforcement system (2) is respectively arranged at the front and rear sides of the working well (1) and is suitable for water-stopping reinforcement of the working well (1); The water-stop reinforcement system (2) comprises a water-stop curtain (21), a plurality of mixing piles (22), a plurality of MJS piles (23) and a plurality of joint MJS piles (26); the water-stop curtain (21) is located at the front side of the working well (1), and the two ends of the water-stop curtain (21) are respectively connected to the two sides of the working well (1); a plurality of mixing piles (22) and a plurality of MJS piles (23) are arranged in sequence between the water-stop curtain (21) and the working well (1); and a plurality of joint MJS piles (26) are arranged at the joint position between the water-stop curtain (21) and the working well (1); A plurality of stirring piles (22) are arranged at the rear side of the working well (1).

2. The end water-stopping reinforcement structure for jacking pipe according to claim 1, characterized in that: A partition (211) is arranged in the middle of the water-stop curtain (21), one end of the partition (211) is connected to the water-stop curtain (21), and the other end of the partition (211) is connected to the working well (1).

3. The end water-stopping reinforcement structure for jacking pipe according to claim 2 is characterized in that: A plurality of MJS piles (23) are arranged below the mixing piles (22) at the front side of the working well (1).

4. The end water-stopping reinforcement structure for jacking pipe according to claim 3 is characterized in that: The water-stopping reinforcement system (2) further comprises an inner drainage well (24) and an outer drainage well (25); a plurality of the outer drainage wells (25) are arranged at intervals on the outer side of the water-stopping curtain (21); a plurality of the inner drainage wells (24) are arranged at intervals on the inner side of the water-stopping curtain (21); and the plurality of the inner drainage wells (24) are all located on both sides of the mixing piles (22) inside the water-stopping curtain (21).

5. The end water-stopping reinforcement structure for jacking pipe according to claim 4, characterized in that: The vertical cross-section of the water-stop curtain (21) is an L-shaped structure, and the bottom of the water-stop curtain (21) is located below the mixing pile (22), the MJS pile (23) and the joint MJS pile (26).

6. The end water-stopping reinforcement structure for jacking pipe according to claim 5, characterized in that: The water-stop curtain (21) is a C-shaped structure, and a group of joint MJS piles (26) are arranged inside and outside the position where the water-stop curtain (21) and the working well (1) meet.

7. The end water-stopping reinforcement structure for jacking pipe according to claim 6, characterized in that: The adjacent MJS piles (23) and the adjacent joint MJS piles (26) are all arranged to interlock with each other.

8. The end water-stopping reinforcement structure for jacking pipe according to claim 7, characterized in that: The mixing pile (22) is a three-axis cement mixing pile.

9. The end water-stopping reinforcement structure for jacking pipe according to claim 8, characterized in that: The water-stop curtain (21) is a cement-soil mixing continuous wall of equal thickness.

10. The end water-stopping reinforcement structure for jacking pipe according to claim 9, characterized in that: The number of the joint MJS piles (26) in a set is nine.

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