Structure for reducing post-construction settlement of pipe jacking

Abstract

The utility model relates to the technical field of pipe jacking construction, in particular to a structure for reducing post-construction settlement of a pipe jacking. According to the structure, a reinforcing hole is reserved in the bottom of a jacking pipe joint, after jacking operation of a jacking pipe is finished, a soil body on the lower portion of the jacking pipe is reinforced through a grouting reinforcing pipe and a reinforcing steel bar bundle, and finally a gap below the jacking pipe is filled with grouting equipment, and the reserved reinforcing hole is sealed. The reinforcing range and depth can be determined in a targeted mode according to the characteristics of the soil layer below the jacking pipe, the reinforcing effect of the soil body below the jacking pipe is further improved by arranging the reinforcing steel bar bundles, and sedimentation control over the jacking pipe is better facilitated. In addition, the structure can directly perform construction operation in the jacking pipe, does not need an additional working surface, has small influence on the surrounding environment, and is worthy of popularization and application in engineering.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, in particular to a structure for reducing post-pipe jacking settlement in soft soil areas. Background Art

[0002] Pipe jacking is a common trenchless technology, often used for laying pipelines and cables. This technology has the advantages of small surface disturbance, low environmental impact, no traffic interference and high construction safety. It is suitable for crossing urban roads, river bottoms, and other areas where traditional excavation methods are difficult to use.

[0003] With the advancement of technology, pipe jacking has been widely used in various geological soil layers. However, there has been no good solution to the post-construction settlement problem of pipe jacking in soft soil areas. Due to the settlement and deformation of the soft strata below the pipe jacking, the pipe jacking is prone to joint leakage, cracking of pipe joints, local dislocation, etc., which seriously affect the later use of the pipe jacking. Therefore, a structure that can effectively reduce the post-construction settlement of pipe jacking in soft soil areas is very necessary. Summary of the invention

[0004] In order to solve the above problems of the prior art, the present invention designs a structure for reducing post-construction settlement of pipe jacking in soft soil areas. The structure can determine the reinforcement range and depth according to the characteristics of the soil layer below the pipe jacking, and effectively reinforce the soft stratum below the pipe jacking through grouting reinforcement combined with a solution of strengthening the steel bar bundle, thereby greatly reducing the post-construction settlement of pipe jacking in soft soil areas.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A structure for reducing post-pipe jacking settlement, wherein reserved reinforcement holes are evenly arranged at the bottom of the jacking pipe; tie rods are inserted into the reserved reinforcement holes; reinforcing steel bar bundles are arranged between the reserved reinforcement holes and the tie rods; the gaps below the reserved reinforcement holes are filled with concrete; and the reserved reinforcement holes are sealed with sealing steel plates.

[0007] Furthermore, the reserved reinforcement hole is a circular hole that is larger at the top and smaller at the bottom.

[0008] Furthermore, embedded parts should be provided on the sides of the reserved reinforcement holes to facilitate welding of the sealing steel plates and sleeves thereto.

[0009] Furthermore, the diameter of the grouting reinforcement pipe should be smaller than the diameter of the lower circular hole of the reserved reinforcement hole.

[0010] Furthermore, the pull rod is composed of a slender rod and an enlarged end, wherein the cross section of the enlarged end is circular and the longitudinal section is T-shaped, and the diameter of the enlarged end should be smaller than the diameter of the lower circular hole of the reserved reinforcement hole.

[0011] Furthermore, the reinforcing steel bar bundle consists of an upper sleeve and a lower steel bar.

[0012] Furthermore, the outer diameter of the sleeve should be slightly smaller than the diameter of the lower circular hole of the reserved reinforcement hole, and the hollow inner diameter of the sleeve should be larger than the slender rod of the pull rod;

[0013] Furthermore, the steel bars are evenly arranged on the sleeve along a ring shape, and the two are connected by welding.

[0014] Furthermore, the number of steel bars on the single reinforcing steel bar bundle is recommended to be 4-8 and should not be too dense.

[0015] Furthermore, the lower end of the steel bar should be cut into a bevel, and the bevel angle should be consistent with the bevel angle of the T-shaped longitudinal section of the enlarged end.

[0016] Furthermore, the embedded parts, blocking steel plates, sleeves and pull rods are all made of steel.

[0017] Correspondingly, the present solution also provides a method for reducing post-pipe jacking settlement in soft soil areas, comprising the following steps:

[0018] S1: When making the jacking pipe segment, reserve reinforcement holes are evenly arranged at the bottom of the pipe segment;

[0019] S2: Before the pipe jacking operation, the reserved reinforcement holes are sealed with plugging steel plates;

[0020] S3: After the jacking operation is completed, the sealing steel plate is removed, and the grouting reinforcement pipe is inserted from the reserved reinforcement hole to reinforce the soil under the jacking pipe;

[0021] S4: After grouting is completed, pull out the grouting reinforcement pipe and insert the tie rod;

[0022] S5: insert the reinforcing steel bar bundle, and weld the sleeve on the upper part of the reinforcing steel bar bundle to the reserved reinforcement hole;

[0023] S6: Lift the tie rod upward, forcing the steel bars at the bottom of the reinforcing steel bar bundle to expand and deform outward under pressure;

[0024] S7: Cut off the tie rod and use grouting equipment to fill the gap below the reserved reinforcement hole;

[0025] S8: Use a plugging steel plate to seal the reserved reinforcement holes;

[0026] Furthermore, steps S4 to S7 should be completed after step S3 is implemented and before the grouting reinforcement slurry solidifies.

[0027] Furthermore, the number and spacing of the reserved reinforcement holes should be determined comprehensively based on the diameter of the jacking pipe section, the characteristics of the soil layer below the jacking pipe, etc.

[0028] Furthermore, the reinforcement depth of the grouting reinforcement pipe should be determined according to the characteristics of the soil layer below the top pipe.

[0029] Furthermore, the lengths of the steel bars and tie rods should be determined comprehensively based on the characteristics of the soil layer below the jacking pipe and the reinforcement range.

[0030] Compared with the prior art, the beneficial effects are:

[0031] By evenly arranging reserved reinforcement holes at the bottom of the jacking pipe section and sealing the reserved reinforcement holes with plugging steel plates before the jacking operation, the reinforcement plan can be planned in advance before the construction. In this way, once the jacking pipe enters the ground, reinforcement measures can be taken quickly to effectively reduce the possibility of settlement.

[0032] By inserting grouting reinforcement pipes to reinforce the soil under the top pipe, the underground soil can be reinforced and the bearing capacity can be enhanced. At the same time, by inserting tie rods and reinforcing steel bar bundles, the soil around the top pipe can be further reinforced, and the tie rods can be lifted to force the steel bars to expand and deform outward under pressure, thereby increasing the connection and support between the soil and the top pipe, thereby reducing the possibility of settlement.

[0033] The reserved reinforcement holes are circular holes that are larger at the top and smaller at the bottom, and embedded parts are set on the sides so that sealing steel plates, sleeves, etc. can be easily welded and fixed to them, ensuring the reliability and stability of the reinforcement measures.

[0034] In this structure, the soft strata under the jacking pipe can be reinforced, effectively reducing the post-construction settlement of the jacking pipe in soft soil areas. Construction work can be carried out directly inside the jacking pipe without the need for an additional working surface, which has little impact on the surrounding environment. The reinforcement range and depth can be determined specifically according to the characteristics of the soil layer under the jacking pipe, and the project applicability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of the arrangement of the reinforcement holes reserved at the bottom of the top pipe in a specific implementation manner;

[0036] Figure 2 It is a plan view of the arrangement of the reinforcement holes reserved at the bottom of the top pipe in a specific implementation manner;

[0037] Figure 3 It is a cross-sectional view of the reinforcement effect of the lower part of the top pipe in a specific implementation method;

[0038] Figure 4 It is a detailed diagram of the pull rod in a specific implementation mode;

[0039] Figure 5 It is a detailed drawing of the reinforcement tendons in the specific implementation mode;

[0040] Figure 6 It is operation step S1 in the specific implementation mode;

[0041] Figure 7 It is operation step S2 in the specific implementation mode;

[0042] Figure 8 It is operation step S3 in the specific implementation mode;

[0043] Fig. 9 It is operation step S4 in the specific implementation mode;

[0044] Fig.10 It is operation step S5 in the specific implementation mode;

[0045] Fig.11 It is operation step S6 in the specific implementation mode;

[0046] Fig.12 It is operation step S7 in the specific implementation mode;

[0047] Fig.13 It is operation step S8 in the specific implementation mode;

[0048] Among them, 1- jacking pipe, 2- reserved reinforcement holes, 3- embedded parts, 4- sealing steel plate, 5- grouting reinforcement pipe, 6- tie rod, 7- reinforced steel bar bundle, 8- grouting equipment, 9- enlarged end, 10- sleeve, 11- steel bar. DETAILED DESCRIPTION

[0049] The present invention is further described in conjunction with the accompanying drawings, but is not intended to limit the present invention.

[0050] See also Figure 1-5 In a specific embodiment, a structure for reducing post-pipe jacking settlement in soft soil areas is designed, and reserved reinforcement holes 2 are evenly arranged at the bottom of the jacking pipe 1; a pull rod 6 is inserted into the reserved reinforcement hole 2; a reinforcing steel bar bundle 7 is arranged between the reserved reinforcement hole 2 and the pull rod 6, and the reinforcing steel bar bundle 7 includes an upper sleeve 10 and a lower steel bar 11; the gap below the reserved reinforcement hole 2 is filled with concrete; the reserved reinforcement hole 2 is sealed with a blocking steel plate 4.

[0051] In this embodiment, the reserved reinforcement hole 2 is a circular hole that is larger at the top and smaller at the bottom. An embedded part 3 is arranged on the side of the reserved reinforcement hole 2 , and the embedded part 3 is welded to the blocking steel plate 4 and the sleeve 10 .

[0052] In this embodiment, the pull rod 6 includes a slender rod and an enlarged end 9, wherein the enlarged end 9 has a circular cross section and a T-shaped longitudinal section, and the diameter of the enlarged end 9 is smaller than the diameter of the lower circular hole of the reserved reinforcement hole 2.

[0053] In this embodiment, the outer diameter of the sleeve 10 is smaller than the diameter of the lower circular hole of the reserved reinforcement hole 2, and the hollow inner diameter of the sleeve 10 is larger than the slender rod of the pull rod 6. The steel bars 11 are evenly arranged on the sleeve 10 along a ring shape, and the two are connected by welding.

[0054] In this embodiment, the lower end of the steel bar 11 is cut into a bevel, and the angle of the bevel is consistent with the angle of the bevel of the T-shaped longitudinal section of the enlarged end 9.

[0055] Correspondingly, in a specific embodiment, a method for reducing post-pipe jacking settlement in soft soil areas is designed. A reinforcement hole 2 is reserved at the bottom of the jacking pipe section 1. After the jacking operation is completed, the soil below the jacking pipe is reinforced by grouting reinforcement pipe 5 and reinforcing steel bar bundle 7. Finally, the gap below is filled by grouting equipment 8 and the reserved reinforcement hole 2 is sealed with a plugging steel plate 4.

[0056] The construction method of this structure is described below:

[0057] See also Figure 6 ,In the first step, when manufacturing the jacking pipe segment 1, the arrangement of the reserved reinforcement holes 2 is determined comprehensively according to the diameter of the jacking pipe segment, the characteristics of the soil layer below the jacking pipe, etc.;

[0058] See also Figure 7 ,The second step, before the jacking operation, the reserved reinforcement hole 2 is sealed with a plugging steel plate 4;

[0059] See also Figure 8 , the third step, after the jacking operation is completed, the blocking steel plate 4 is removed, and the grouting reinforcement pipe 5 is inserted from the reserved reinforcement hole 2 to reinforce the soil under the jacking pipe;

[0060] See also Figures 9 to 11 , Step 4, after grouting is completed, pull out the grouting reinforcement pipe 5, insert the tie rod 6 and the reinforcing steel bar bundle 7 in sequence before the slurry solidifies, and weld the sleeve 10 on the upper part of the reinforcing steel bar bundle 7 to the reserved reinforcement hole 2. Lift the tie rod 6 upwards, forcing the steel bars 11 at the lower part of the reinforcing steel bar bundle 7 to expand and deform outward under pressure;

[0061] See also Fig.12 , the fifth step is to cut off the tie rod 6 and use the grouting equipment 8 to fill the gap below the reserved reinforcement hole 2;

[0062] See also Fig.13 , step 6, using the blocking steel plate 4 to seal the reserved reinforcement hole 2.

Claims

1. A structure for reducing post-pipe jacking settlement, characterized in that: Reserved reinforcement holes (2) are evenly arranged at the bottom of the top pipe (1); a pull rod (6) is inserted into the reserved reinforcement hole (2); a reinforcing steel bar bundle (7) is arranged between the reserved reinforcement hole (2) and the pull rod (6); the gap below the reserved reinforcement hole (2) is filled with concrete; and the reserved reinforcement hole (2) is provided with a sealing steel plate (4) for sealing.

2. The structure for reducing post-pipe jacking settlement according to claim 1, characterized in that: The reserved reinforcement hole (2) is a circular hole that is larger at the top and smaller at the bottom. An embedded part (3) is arranged on the side of the reserved reinforcement hole (2), and the embedded part (3) is welded to the sealing steel plate (4) and the sleeve (10).

3. The structure for reducing post-pipe jacking settlement according to claim 1, characterized in that: The pull rod (6) comprises a slender rod and an enlarged end (9), wherein the enlarged end (9) has a circular cross section and a T-shaped longitudinal section, and the diameter of the enlarged end (9) is smaller than the diameter of the lower circular hole of the reserved reinforcement hole (2).

4. The structure for reducing post-pipe jacking settlement according to claim 1, characterized in that: The reinforcing steel bar bundle (7) comprises an upper sleeve (10) and a lower steel bar (11).

5. The structure for reducing post-pipe jacking settlement according to claim 4 is characterized in that: The outer diameter of the sleeve (10) is smaller than the diameter of the lower circular hole of the reserved reinforcement hole (2), and the hollow inner diameter of the sleeve (10) is larger than the slender rod of the pull rod (6).

6. The structure for reducing post-pipe jacking settlement according to claim 4, characterized in that: The steel bars (11) are evenly arranged on the sleeve (10) along a ring shape, and the two are connected by welding.

7. The structure for reducing post-pipe jacking settlement according to claim 4, characterized in that: The number of steel bars (11) on a single reinforcing steel bar bundle (7) is 4-8.

8. The structure for reducing post-pipe jacking settlement according to claim 4, characterized in that: The lower end of the steel bar (11) is cut into an inclined surface, and the angle of the inclined surface is consistent with the angle of the inclined surface of the T-shaped longitudinal section of the enlarged end (9).

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