Long-distance pipe jacking construction structure of water-rich hard rock stratum
By designing the top pipe construction structure of multiple top pipe sections, thick mud rings and thixotropic mud silt in the hydraulically rich hard rock formation, the problem of sediment and resistance-reducing mud at the bottom of the pipe section in the top pipe construction is solved, which improves the top pipe efficiency and reduces the project cost.
Patent Information
- Application Number
- CN202421338312.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-06-12
AI Technical Summary
When the pipe top construction is carried out in the water-rich hard rock formation, due to the influence of groundwater and rock formations, sediment is prone to appear at the bottom of the pipe joints, and the resistance reduction mud is diluted and washed out, resulting in the reduction of the efficiency of the circulating mud super discharge and the ejection.
A long-distance hoisting structure for hydraulically rich rock formations is designed, including multiple hoisting sections and corresponding thick mud rings and thixotropic mud silts. The thick mud ring is formed by injecting thick mud behind the pipe section wall and filling the thixotropic mud between the two adjacent thick mud rings to form an independent thixotropic mud silt to reduce friction and resist water pressure.
It effectively solves the problem of failure of sediment and drag-reducing mud at the bottom of the pipe joint, improves the ejection efficiency, reduces the engineering cost, and has good versatility and promotion and application prospects.
Smart Images
Figure CN222976819U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipe jacking and shield construction, and specifically discloses a long-distance pipe jacking construction structure for water-rich hard rock strata. Background Technique
[0002] With the continuous development of social urbanization, the development and utilization speed of underground space in China has increased rapidly, and the geology encountered in underground construction has become more and more complex. Among them, in the process of underground pipeline construction, the pipe jacking process has a wide range of applications. When pipe jacking construction is carried out in water-rich hard rock strata, due to the influence of groundwater and rock strata, there will be a series of problems such as sediment at the bottom of the pipe section, dilution and scouring failure of the drag reduction mud, and over-discharge of circulating mud. Seriously, it will affect the jacking distance and greatly increase the project cost. Content of the Utility Model
[0003] The technical problem solved by the utility model is: to provide a long-distance pipe jacking construction structure for water-rich hard rock strata, so as to solve the problems that during the pipe jacking construction process, due to the influence of groundwater and rock strata, sediment will appear at the bottom of the pipe section, and the drag reduction mud is easily diluted and scoured and fails, resulting in over-discharge of circulating mud and reduction of jacking efficiency.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] The long-distance pipe jacking construction structure for water-rich hard rock strata is characterized in that it includes a plurality of jacking sections arranged in sequence in the tunnel and composed of the same number of pipe sections, a thick mud ring arranged corresponding to each of the plurality of jacking sections behind the wall of the corresponding mud ring injection pipe section, and a thixotropic mud bin arranged between two adjacent thick mud rings and filled with thixotropic mud inside; the jacking section includes a mud ring injection pipe section at the first section and a slag removal and grouting pipe section at the middle position; the mud ring injection pipe section is reserved with a plurality of thick mud injection holes along the circumferential direction for injecting thick mud slurry behind the pipe section wall to form a thick mud ring; the bottom of the slag removal and grouting pipe section is reserved with a slag cleaning and grouting port for pumping thixotropic mud into the thixotropic mud bin, or pumping out the mud slag in the thixotropic mud bin at the position where the slag grouting pipe section is located and then pumping in thixotropic mud.
[0006] Preferably, the socket and spigot position of the pipe section is reinforced with circumferential steel bars in a densified manner to avoid pipe section damage caused by stress concentration during jacking.
[0007] Preferably, the slag cleaning and grouting port is a round hole with a diameter of 12-18 cm, and the slag cleaning and grouting port is connected with a relay pipe, and a valve is arranged on the relay pipe.
[0008] Preferably, a pressure gauge is arranged at one end of the relay pipe close to the slag cleaning and grouting port.
[0009] Preferably, 3 to 6 thick mud injection holes are reserved along the circumferential direction of the mud ring injection pipe section; a detachable thick mud plug is arranged in the mud injection hole.
[0010] Preferably, the jacking section is composed of 20 to 35 pipe sections.
[0011] Preferably, the width of the thick mud ring is 1 to 3 m in the jacking direction.
[0012] Preferably, the thixotropic slurry is prepared by mixing water, bentonite, and gypsum powder in a mass ratio of 4 to 5:1:0.03 to 0.05.
[0013] Preferably, the thick slurry is prepared by mixing water, bentonite, and gypsum powder in a mass ratio of 1:0.8 to 1:1.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: When implemented in a water-rich hard rock formation, due to the influence of groundwater and rock formations, a series of problems such as sediment at the bottom of the pipe section, failure of the drag reduction slurry, and excessive discharge of the circulating slurry may occur. In severe cases, it will affect the jacking distance and increase the project cost. The present utility model has strong versatility, good social benefits, and good prospects for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is the front view structural schematic diagram of the present utility model;
[0016] Figure 2 is Figure 1 the enlarged schematic diagram of a partial structure in
[0017] Figure 3 is the cross-sectional view of the slag discharge and grouting pipe section;
[0018] Figure 4 is the cross-sectional view of the mud ring injection pipe section;
[0019] Figure 5 is Figure 2 the sectional view at A-A in
[0020] Figure 6 is the construction flow chart of the present utility model;
[0021] The meanings of the marks in the above figures are as follows: 1 - pipe section; 2 - slag discharge and grouting pipe section; 201 - slag cleaning and grouting port; 3 - mud ring injection pipe section; 301 - thick mud injection hole; 3011 - thick mud plug; 4 - slurry pipeline; 5 - hole plug; 6 - relay pipe; 601 - valve; 602 - pressure gauge; 7 - mud sump; 8 - thick mud ring; 9 - pipe jacking machine; 10 - rock and soil; 11 - working shaft; 12 - thixotropic slurry sump; 13 - thick slurry pump; 14 - thixotropic slurry pump; 15 - shield machine; 16 - jacking section. Detailed implementation mode
[0022] The following further describes the present utility model in the form of specific embodiments in conjunction with the accompanying drawings. It should be noted that the following implementation modes are only illustrative explanations of the present utility model by way of example, but the protection scope of the present utility model is not limited thereto. The described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the protection scope of the present utility model.
[0023] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments and is not limited to what the present utility model discloses. Moreover, the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model.
[0024] Embodiment 1
[0025] The long-distance pipe jacking construction structure in a water-rich hard rock formation includes a plurality of jacking sections 16 arranged in sequence and jacked into the tunnel and composed of the same number of pipe sections 1, thick mud rings 8 arranged in one-to-one correspondence with the plurality of jacking sections 16 behind the walls of the corresponding mud ring injection pipe sections 3, and a thixotropic mud chamber 12 arranged between adjacent two thick mud rings 8 and filled with thixotropic mud inside; the jacking section 16 includes a mud ring injection pipe section 3 at the first section and a slag discharge and grouting pipe section 2 at the middle position; the mud ring injection pipe section 3 is reserved with a plurality of thick mud injection holes 301 along the circumferential direction for injecting thick mud behind the pipe section wall to form a thick mud ring 8; the bottom of the slag discharge and grouting pipe section 2 is reserved with a slag cleaning and grouting port 201 for pumping thixotropic mud into the thixotropic mud chamber 12 or pumping out the mud and slag in the thixotropic mud chamber at the position of the slag grouting pipe section and then pumping in thixotropic mud.
[0026] Further, in a preferred implementation scheme, the socket and spigot positions of the pipe section 1 are reinforced with circumferential steel bars in a densified manner to avoid the pipe section being damaged due to stress concentration during the jacking process.
[0027] Further, in a preferred implementation scheme, the slag cleaning and grouting port 201 is a round hole with a diameter of 12 - 18 cm, and the slag cleaning and grouting port 201 is connected with a relay pipe 6, and a valve 601 is arranged on the relay pipe 6.
[0028] Further, in a preferred embodiment, a pressure gauge 602 is provided at one end of the relay pipe 6 close to the slag cleaning and grouting port 201, so that the pressure in the corresponding thixotropic mud bin can be observed in real time through the pressure gauge 602, to judge whether the initial pumping volume of the thixotropic mud in the thixotropic mud bin meets the requirements or whether it is necessary to supplement the thixotropic mud in the thixotropic mud bin.
[0029] Further, in a preferred embodiment, 3 to 6 thick mud injection holes 302 are reserved along the circumferential direction of the mud ring injection pipe section 3; a detachable thick mud plug 3011 is arranged in the mud injection hole 301, and the thick mud plug 3011 can prevent the thixotropic mud from leaking out through the thick mud injection hole 301 when the mud ring injection pipe section 3 passes through the thixotropic mud bin during jacking.
[0030] Further, in a preferred embodiment, the jacking section 16 is composed of 20 to 35 pipe sections 1.
[0031] Further, in a preferred embodiment, the width of the thick mud ring 8 is 1 to 3 m along the jacking direction.
[0032] Further, in a preferred embodiment, the thixotropic mud is prepared by mixing water, bentonite, and gypsum powder in a mass ratio of 4 to 5:1:0.03 to 0.05; the thick mud is prepared by mixing water, bentonite, and gypsum powder in a mass ratio of 1:0.8 to 1:1; wherein, bentonite is an inorganic non-metallic mineral material with montmorillonite as the main component mineral widely used as a water rheology agent. The montmorillonite crystal structure unit layer is connected by intermolecular forces, and water molecules and other organic molecules can easily enter its interlayer domain, making bentonite have excellent properties such as water absorption and swelling, high dispersibility, and adsorption; adding gypsum powder to bentonite can achieve the effect of fluid thickening; in addition, the thixotropic mud and the thick mud can be prepared by using a mud shear pump system, and the mud shear pump system is composed of a shear pump main body, a shear funnel, and a mud tank, and can provide a highly shearing shear device for the rapid hydration of the polymer to reduce the slurry shear ratio rate and improve the mud gel strength.
[0033] Example 2
[0034] The construction method of the present utility model is as follows. Please refer to Figures 1 to 6 , which includes the following steps:
[0035] S1. Pipe section treatment: Prefabricate the pipe sections in the factory; the pipe sections 1 are divided into ordinary pipe sections, slag discharge and grouting pipe sections 2, and mud ring injection pipe sections 3; when prefabricating all pipe sections, the circumferential steel bars at the socket and spigot positions of the pipe sections are densified for reinforcement to avoid pipe section damage caused by stress concentration during jacking.
[0036] Please refer to Figure 3, a slag discharge and grouting nozzle 201 is reserved at the bottom of the slag discharge and grouting pipe section 2. The slag discharge and grouting nozzle 201 is a circular hole with a diameter of 12 - 18 cm. The slag discharge and grouting nozzle 201 is connected to a relay pipe 6, and a valve 601 is arranged on the relay pipe 6; when the jacking operation stops, the slag discharge and grouting nozzle 201 can be connected to a thixotropic mud pump 14 through the relay pipe 6 and a mud pipeline 4 in sequence to pump thixotropic mud into the thixotropic mud chamber 12 at the position where the slag discharge and grouting pipe section 2 is located, or pump out the mud and slag in the thixotropic mud chamber at the position where the slag discharge and grouting pipe section 2 is located, and then pump in thixotropic mud; after pumping thixotropic mud into the thixotropic mud chamber, before resuming the jacking operation, all valves 601 on the jacking sections should be closed to maintain the pressure in the thixotropic mud chamber;
[0037] Please refer to Figure 4 and Figure 5 , three to six thick mud injection holes 301 are arranged along the circumferential direction of the mud ring injection pipe section 3. The thick mud injection holes 301 are connected to a thick mud pump 13 through a mud pipeline 4 to inject thick mud behind the wall of the mud ring injection pipe section 3 to form a thick mud ring 8; a detachable thick mud plug 3011 is arranged in the thick mud injection hole 301; after injecting thick mud, before resuming the jacking operation, thick mud plugs 3011 should be installed in all thick mud injection holes 301 to prevent thixotropic mud from leaking out through the thick mud injection holes 301 when the mud ring injection pipe section 3 passes through the thixotropic mud chamber during the jacking process;
[0038] S2. Jacking pipe launching: Carry out jacking pipe launching construction on the pipe section by conventional methods;
[0039] S3. Progressive jacking pipe construction with a combined thick mud ring and thixotropic mud chamber:
[0040] Please refer to Figure 6 , for the construction of the first jacking section, the first pipe section uses a mud ring injection pipe section L 1 , the pipe sections at the middle position use slag discharge and grouting pipe sections P 1 , and the pipe sections at the remaining positions use ordinary pipe sections; after all pipe sections are jacked in place, the first jacking section will be in the first thixotropic mud chamber position, stop the jacking operation, connect the thick mud injection holes 301 of the mud ring injection pipe section L 1 to the thick mud pump 13 through the mud pipeline 4, and inject thick mud along the circumferential direction behind the wall of the mud ring injection pipe section L 1 to form a fixed-position, support and water-blocking closed ring, that is, a thick mud ring N 1 , so that a thixotropic mud chamber C 1 is formed between the thick mud ring N 1 and the hole plug 5, and then connect the slag discharge and grouting nozzle 201 of the slag discharge and grouting pipe section P 1 to the thixotropic mud pump 14 through the relay pipe 6 and the mud pipeline 4 in sequence to pump thixotropic mud into the thixotropic mud chamber C 1Pump in thixotropic slurry internally, then close all valves 601 on the jacking sections. Install thick slurry stoppers 3011 in all thick slurry injection holes 301, resume the jacking operation, and construct the subsequent jacking sections section by section in the following manner;
[0041] Please refer to Figure 6 , for the construction of the i-th jacking section, where i represents the serial number of the currently constructed jacking section, i ≥ 2 and i is an integer; during the jacking process, replace the first ordinary pipe section 1 with a mud ring injection pipe section L i , replace the ordinary pipe section 1 at the middle position with a slag discharge and grouting pipe section P i , and use ordinary pipe sections 1 for the pipe sections at other positions; after all the pipe sections in the i-th jacking section are jacked into place, at this time, the first jacking section will move forward to the newly formed next thixotropic slurry compartment, namely the i-th thixotropic slurry compartment, stop the jacking operation, and connect the thick slurry injection hole 301 of the mud ring injection pipe section L 1 to the thick slurry pump 13 through the slurry pipeline 4. Inject thick slurry along the circumferential direction behind the wall of the mud ring injection pipe section L 1 to form a closed ring that is fixed in position, has support and water-blocking functions, namely the thick mud ring N i , the thick mud ring N i will form a thixotropic slurry compartment C i-1 with the thick mud ring N i constructed in the previous jacking construction section, then connect the slag cleaning and grouting port 201 of the slag discharge and grouting pipe section P 1 to the thixotropic slurry pump 14 through the relay pipe 6 and the slurry pipeline 4 in sequence to pump thixotropic slurry into the thixotropic slurry compartment C i internally. Then close all valves 601 on the jacking sections, install thick slurry stoppers 3011 in all thick slurry injection holes 301, resume the jacking operation, and conduct the construction of the next jacking section;
[0042] Follow the above steps until all jacking sections are constructed; among them, the number of pipe sections in each jacking section is the same, and the number of pipe sections in each jacking section is 20 - 35 sections;
[0043] Please refer to Figure 6, during the construction of pipe jacking in sections with a combined thick mud ring and thixotropic mud bin, the i-th jacking section is jacked in sections at the working well end, while the 1st jacking section moves forward (towards the heading face) to the next thixotropic mud bin position. Thus, along the pipe joint jacking direction, the 1st thixotropic mud bin position, the 2nd thixotropic mud bin position, the 3rd thixotropic mud bin position,..., the i-th thixotropic mud bin position will be formed in sequence. And since the thick mud ring 8 adheres to the rock and soil 10 after formation, the thick mud ring and the thixotropic mud bin will not move forward along with the pipe joint jacking. Therefore, when all the pipe joints of the i-th jacking section are jacked in place and the jacking operation stops, the 1st jacking section will always be in the newly formed i-th thixotropic mud bin position. That is, along the direction from the heading face to the working well, the corresponding relationships between the jacking section and the thixotropic mud bin position, the slag discharge and grouting pipe joint and the thixotropic mud bin, and the mud ring injection pipe joint and the thick mud ring are as follows:
[0044] The 1st jacking section - the i-th thixotropic mud bin position, the slag discharge and grouting pipe joint P 1 - the thixotropic mud bin C i , the mud ring injection pipe joint L 1 - the thick mud ring N i ;
[0045] The 2nd jacking section - the (i - 1)-th thixotropic mud bin position, the slag discharge and grouting pipe joint P 2 - the thixotropic mud bin C i-1 , the mud ring injection pipe joint L 2 - the thick mud ring N i-1 ;
[0046] The 2nd jacking section - the (i - 1)-th thixotropic mud bin position, the slag discharge and grouting pipe joint P 3 The thixotropic mud bin C i-2 , the mud ring injection pipe joint L 3 - the thick mud ring N i-2 ;
[0047] …;
[0048] The i-th jacking section - the 1st thixotropic mud bin position, the slag discharge and grouting pipe joint P i The thixotropic mud bin C 1 , the mud ring injection pipe joint L i - the thick mud ring N 1 ;
[0049] Based on the above, when all the pipe joints of any jacking section are jacked in place and the jacking operation stops, only the mud ring injection pipe joint L in the 1st jacking section 1 can always be used to inject thick mud to form a thick mud ring and a thixotropic mud bin with fixed positions, and pump thixotropic mud into the thixotropic mud bin through the slag discharge and grouting pipe joint P 1 .
[0050] In addition, during the construction process, when all the pipe joints in the i-th jacking section are jacked in place and the jacking operation stops, in addition to the thick mud ring N i and the thixotropic mud chamber C i formed during the construction, and pumping thixotropic mud into the thixotropic mud chamber C i , the following measures should also be taken according to the actual construction situation:
[0051] Supplement thick mud to the thick mud ring formed during the construction of the previous jacking section to ensure the support and water-blocking effects of the thick mud ring; for example, when it is monitored that the pressure in the thixotropic mud chamber C 6 is insufficient, it is necessary to supplement thick mud to the thick mud ring N 5 , the thick mud ring N 6 . The corresponding mud ring injection pipe joints L i-5 are located at the position of the thick mud ring N 6 , and the mud ring injection pipe joints L i-4 are located at the position of the thick mud ring N 5 . Therefore, thick mud can be pumped through the mud ring injection pipe joints L i-5 , the mud ring injection pipe joints L i-4 to supplement the thick mud ring N 6 , the thick mud ring N 5 ;
[0052] And / or, supplement thixotropic mud to the thixotropic mud chamber formed during the construction of the previous jacking section to balance the groundwater pressure, or first drain the mud and slag in the thixotropic mud chamber formed during the construction of the previous jacking section, and then supplement thixotropic mud to prevent a large amount of sediment from being generated at the bottom of the pipe joint, resulting in the failure of the resistance reduction effect of the thixotropic mud; for example, when it is monitored that the pressure in the thixotropic mud chamber C 6 is insufficient, the corresponding thixotropic mud chamber C 6 is located at the position of the slag discharge and grouting pipe joint P i-5 . Therefore, the above operations can be implemented through the slag discharge and grouting pipe joint P i-5 , that is, connect the relay pipe 6 on the slag discharge and grouting pipe joint P i-5 to the slag discharge and grouting pipe, and inject thixotropic mud into the thixotropic mud chamber C 6 through the slag discharge and grouting pump, or first drain the mud and slag in the thixotropic mud chamber and then inject thixotropic mud.
[0053] To sum up, based on the pipe jacking construction structure of the present utility model, as the pipe joints at the working well are continuously jacked, the first jacking section will gradually move forward to each thixotropic mud position. The thick mud ring can be formed by injecting thick mud at each thixotropic mud position using the mud ring injection pipe joint L 1 , so that multiple independent, closed and mutually continuous thixotropic mud chambers are enclosed between adjacent two thick mud rings, the pipe joint wall and the rock and soil, and the slag discharge and grouting pipe joint P 1Pump thixotropic slurry into each thixotropic slurry bin. In this way, through the combined action of each thixotropic slurry bin, firstly, the frictional force during the jacking of the pipe section can be reduced to ensure the smooth jacking of the pipe section; secondly, a certain pressure can be formed to resist the water pressure, preventing excessive groundwater from seeping into the thixotropic slurry bin, which may cause the dilution and failure of the slurry and the over-discharge of the slurry. Especially in the construction project of long-distance pipe jacking in water-rich hard rock, the utility model has a good application effect.
[0054] 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 long distance pipe jacking construction structure for water-rich hard rock formations, characterized in that: It includes a plurality of jacking sections composed of the same number of pipe sections which are jacked in sequence in the tunnel, a thick mud ring which is arranged behind the wall of the corresponding mud ring injection pipe section in one-to-one correspondence with the plurality of jacking sections, and a thixotropic mud bin which is arranged between two adjacent thick mud rings and is filled with thixotropic mud; the jacking section includes a mud ring injection pipe section located at the first section and a slag discharge grouting pipe section located at the middle position; the mud ring injection pipe section is provided with a plurality of thick mud injection holes along the annular direction for injecting thick mud behind the pipe section wall to form a thick mud ring; a slag removal grouting port is provided at the bottom of the slag discharge grouting pipe section for pumping thixotropic mud into the thixotropic mud bin, or pumping out the mud and slag in the thixotropic mud bin at the slag grouting pipe section and then pumping in thixotropic mud.
2. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 1, characterized in that: The socket position of the pipe joint is reinforced with circumferential steel bars to avoid stress concentration during jacking and causing damage to the pipe joint.
3. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 1, characterized in that: The slag cleaning grouting port is a circular hole with a diameter of 12 to 18 cm. The slag cleaning grouting port is connected to a relay pipe, and a valve is arranged on the relay pipe.
4. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 3, characterized in that: The relay pipe is provided with a pressure gauge at one end close to the slag cleaning and grouting port.
5. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 1, characterized in that: The mud ring injection pipe section is provided with 3 to 6 thick mud injection holes along the annular direction; and a detachable thick mud plug is arranged in the mud injection hole.
6. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 1, characterized in that: The jacking section is composed of 20 to 35 pipe sections.
7. The long distance pipe jacking construction structure for water-rich hard rock formations according to claim 1, characterized in that: The width of the thick mud ring is 1 to 3 m along the jacking direction.