Sand blocking and water-stopping structure and construction method for the jacking receiving well opening

Abstract

A structure for blocking sand and stopping water at the opening of a jacking pipe receiving well comprises a receiving well and a jacking pipe, one end of the jacking pipe being inserted into the receiving well through the lower opening of the receiving well, and the gap formed by the receiving well and the jacking pipe at the opening being blocked by brick wall and reinforced concrete. A filter drainage pipe is inserted into the brick wall. The construction method comprises: 1) pushing the jacking pipe into the opening of the receiving well; 2) installing a submersible pump and a mud pump; 3) pumping out the silt in the receiving well and replenishing water; 4) performing silt pumping and water replenishment operations in layers; 5) performing brick wall blocking and filter drainage pipe construction; 6) installing a blind plate; 7) removing the jacking pipe head; 8) performing rebar planting and reinforced concrete blocking construction; 9) draining the slurry in the receiving well and removing the blind plate. The patent of the present invention adopts the above structure and method to achieve a low-cost construction solution to replace the existing water-stop curtain structure, thereby solving the problems of complex and difficult sand blocking and water-stopping construction at the opening of the jacking pipe receiving well in water-bearing sandy soil layers.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal sewage treatment, and in particular to a sand-blocking and water-stopping structure for a jacking pipe receiving well opening in a water-bearing sandy soil zone and a construction method thereof. Background Art

[0002] Pipe jacking refers to a concealed excavation method used when underground pipelines or tunnels cross various obstacles such as railways, roads, rivers, or buildings. During pipe jacking construction, when encountering situations where it is necessary to cross water bodies such as rivers and ponds, the site selection of the pipe jacking working well and receiving well is often located in the water-bearing sand layer by the river due to the topographical and geological conditions, the surrounding construction environment, and investment. Especially when it involves crossing a river with navigation functions, the elevation of the top of the pipe jacking must be a certain distance below the river scour line, resulting in the bottom elevation of the receiving well being much lower than the ground elevation. Therefore, when the pipe jacking head passes through the receiving well opening, if no special treatment is performed, it is easy for sand and gravel outside the opening and seepage water to flow into the receiving well through the gap between the receiving well opening and the outer wall of the pipe jacking, affecting normal construction and posing a major safety hazard. Under such high groundwater pressure conditions, it is often difficult to complete the hole sealing using conventional methods. In addition, for deeply buried receiving wells located in complex geological conditions, grouting reinforcement machinery needs to pass through different strata to grout the area around the receiving well hole to form a water-stop curtain. This off-well grouting method has a deep reinforcement depth, is time-consuming, costly, and the grouting quality is difficult to control, and often cannot meet the actual needs of the project. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sand blocking and water-stopping structure and construction method for the opening of a jacking pipe receiving well, so as to replace the existing water-stopping curtain structure with a low-cost construction scheme, and solve the problems of complex and difficult construction of sand blocking and water-stopping at the opening of a jacking pipe receiving well in water-bearing sandy soil layers.

[0004] To solve the above technical problems, the present invention adopts a technical solution: a sand blocking and water stopping structure for a jacking pipe receiving well hole, comprising a receiving well and a jacking pipe, wherein one end of the jacking pipe is inserted into the receiving well through a hole on the lower wall of the receiving well, and the gap formed by the receiving well and the jacking pipe at the hole position is sealed by a brick wall and reinforced concrete.

[0005] The brick wall blocking is located in the outer layer, and the reinforced concrete blocking is located in the inner layer;

[0006] A reverse filtration drainage pipe is provided through the brick wall plugging;

[0007] The construction method of the sand blocking and water-stopping structure at the opening of the jacking receiving well specifically includes the following steps:

[0008] 1) Install the jacking head at the downstream end of the jacking pipe, and use the jacking equipment to push the jacking pipe and the jacking head into the hole at the bottom of the receiving well;

[0009] 2) Install a submersible pump and a mud pump in the open space around the wellhead at the top of the receiving well;

[0010] 3) Continuously pump out the silt in the receiving well through a mud pump, and simultaneously use a submersible pump to pump water from a nearby water source to replenish the receiving well;

[0011] 4) After the mud pump has pumped the silt in the receiving well to the top elevation of the cave entrance, repeat step 2) in layers of 20-30 cm and continue pumping out the silt and replenishing water in layers;

[0012] 5) After each single layer of drainage and water replenishment, brick wall sealing and reverse filtration drainage pipe construction work shall be carried out until all brick wall sealing and reverse filtration drainage pipe construction are completed;

[0013] 6) Manually enter the jacking pipe from the upstream end and install a blind plate at the end of the jacking pipe;

[0014] 7) Remove the jacking machine head at the end of the jacking pipe and lift it out of the receiving well;

[0015] 8) Carry out the construction of planting reinforcement and reinforced concrete plugging in the receiving well;

[0016] 9) After the reinforced concrete plug has solidified, use a mud pump to drain the remaining mud in the receiving well and remove the blind plate.

[0017] In a preferred solution, the brick wall plugging and the reinforced concrete plugging are both arranged in a ring shape around the top pipe at the opening.

[0018] In a preferred solution, the anchor bars are pre-buried in double rows in an annular direction on the side wall of the receiving well.

[0019] In a preferred solution, the reverse filtration drainage pipe is filled with graded gravel.

[0020] In a preferred solution, in step 1), a blind plate is pre-installed on the end of the jacking pipe before it is pushed into the hole, thereby eliminating the operation of manually installing the blind plate in step 6).

[0021] In a preferred solution, in step 9), the sealing performance of the reinforced concrete plug is pre-checked before removing the blind plate, and the blind plate is removed only when the sealing performance of the reinforced concrete plug is ensured to be good.

[0022] The present invention provides a pipe jacking receiving well opening sand blocking and water stopping structure and construction method, which has the following beneficial effects by adopting the above structure and method:

[0023] (1) As the overall structure of the project is simpler, the construction operation steps are simplified, which speeds up the construction progress and reduces the amount of work and cost;

[0024] (2) The problem of sand leakage and water seepage at the receiving well opening can be effectively solved by first constructing a brick wall to achieve a simple initial blockage and then relying on reinforced concrete to achieve effective blockage;

[0025] (3) There are no complicated construction steps during the construction process, and the construction safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples:

[0027] Figure 1 It is a schematic diagram of the overall facade structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the elevation structure at the hole of the present invention.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the hole of the present invention.

[0030] In the figure: receiving well 1, hole 2, jacking pipe 3, jacking head 4, brick wall plugging 5, reinforced concrete plugging 6, filter drainage pipe 7, embedded steel bar 8, blind plate 9, submersible pump 10, mud pump 11. DETAILED DESCRIPTION

[0031] Example 1:

[0032] A jacking pipe receiving well opening sand blocking and water stopping structure comprises a receiving well 1 and a jacking pipe 3, characterized in that one end of the jacking pipe 3 penetrates into the receiving well 1 through an opening 2 on the well wall at the lower part of the receiving well 1, and a gap formed between the receiving well 1 and the jacking pipe 3 at the opening 2 is blocked by a brick wall 5 and a reinforced concrete block 6;

[0033] The brick wall blocking 5 is located in the outer layer, and the reinforced concrete blocking 6 is located in the inner layer;

[0034] A reverse filtration drainage pipe 7 is provided through the brick wall 5;

[0035] In a preferred solution, the brick wall plugging 5 and the reinforced concrete plugging 6 are both arranged in a ring shape around the top pipe 3 at the opening 2.

[0036] In a preferred solution, the embedded reinforcement bars 8 are pre-buried in a double-row circumferential direction on the side wall of the opening 2 of the receiving well 1 .

[0037] In a preferred solution, the reverse filtration drainage pipe 7 is filled with graded gravel.

[0038] Example 2:

[0039] Based on Example 1:

[0040] The receiving shaft 1 is made of C25 reinforced concrete structure, and its size is adjusted according to the project requirements;

[0041] The receiving well opening 2 is located on the wall of the receiving well 1. The opening 2 is circular and has a diameter about 0.40m larger than the diameter of the top pipe 3.

[0042] The jacking pipe 3 is made of reinforced concrete pipe, steel pipe or other pipe materials suitable for jacking construction, and the pipe diameter is selected according to the project requirements;

[0043] The pipe jacking machine head 4 adopts a mud-water balance type pipe jacking machine and an earth pressure balance type pipe jacking machine, and the model is selected according to the project needs;

[0044] The brick wall 5 is made of MU30 bricks with a thickness of 24 cm.

[0045] The reinforced concrete plug 6 adopts C30 reinforced concrete structure and is connected to the receiving well opening 2 by planting steel bars 8;

[0046] The reverse filter drainage pipe 7 adopts DN30PVC pipe;

[0047] The planted reinforcement 8 is made of φ12 steel bars, each of which is 20 cm long.

[0048] The blind plate 9 is made of steel and has a diameter that is the same as the inner diameter of the jacking pipe 3 .

[0049] Example 3:

[0050] The construction method of the sand blocking and water-stopping structure for the jacking receiving well opening described in Example 1 specifically includes the following steps:

[0051] 1) Install the jacking head 4 at the downstream end of the jacking pipe 3, and use the jacking equipment to push the jacking pipe 3 and the jacking head 4 into the hole 2 at the bottom of the receiving well 1;

[0052] 2) Install a submersible pump 10 and a mud pump 11 in the open space around the top of the receiving well 1;

[0053] 3) The slurry pump 11 continuously pumps out the sediment in the receiving well 1, and simultaneously the submersible pump 10 pumps water from a nearby water source to replenish the receiving well 1;

[0054] 4) After the mud pump 11 has pumped the silt in the receiving well 1 to the top elevation of the cave entrance 2, repeat step 2) in layers of 20-30 cm and pump out the silt and replenish water in layers;

[0055] 5) After each single layer of drainage and water replenishment, carry out brick wall blocking 5 and reverse filtration drainage pipe 7 construction until all brick wall blocking 5 and reverse filtration drainage pipe 7 construction are completed;

[0056] 6) Manually enter the jacking pipe 3 from the upstream end and install the blind plate 9 at the end of the jacking pipe 3;

[0057] 7) Remove the jacking head 4 at the end of the jacking pipe 3 and lift it out of the receiving well 1;

[0058] 8) Carry out the construction of planting reinforcement 8 and reinforced concrete plugging 6 in the receiving well 1;

[0059] 9) After the reinforced concrete plug 6 solidifies, the remaining mud in the receiving well 1 is discharged using the mud pump 11, and the blind plate 9 is removed while ensuring that the reinforced concrete plug 6 is well sealed.

[0060] Example 4:

[0061] On the basis of Example 3, in step 1), the blind plate 9 is pre-installed on the end of the jacking pipe 3 before it is pushed into the hole 2, which can omit the operation of manually installing the blind plate 9 in step 6), further achieving the purpose of simplifying the construction steps.

Claims

1. A sand blocking and water stopping structure for a jacking pipe receiving well, comprising a receiving well (1) and a jacking pipe (3), characterized in that: One end of the jacking pipe (3) is inserted into the receiving well (1) through the hole (2) on the lower wall of the receiving well (1), and the gap formed between the receiving well (1) and the jacking pipe (3) at the hole (2) is sealed by a brick wall (5) and a reinforced concrete blockage (6); The brick wall seal (5) is located in the outer layer, and the reinforced concrete seal (6) is located in the inner layer; A reverse filtration drainage pipe (7) is provided through the brick wall plugging (5); The construction method of the sand blocking and water-stopping structure at the opening of the jacking receiving well specifically includes the following steps: 1) Installing a jacking machine head (4) at the downstream end of the jacking pipe (3), and pushing the jacking pipe (3) and the jacking machine head (4) into the hole (2) at the bottom of the receiving well (1) through the jacking equipment; 2) Installing a submersible pump (10) and a mud pump (11) on the open space around the top wellhead of the receiving well (1); 3) Continuously pumping out the silt in the receiving well (1) by means of a slurry pump (11), and simultaneously pumping water from a nearby water source by means of a submersible pump (10) to replenish water in the receiving well (1); 4) After the mud pump (11) has pumped the silt in the receiving well (1) to the top elevation of the cave entrance (2), repeat step 2) in layers of 20-30 cm and pump out the silt and replenish water in layers; 5) After each single layer of drainage and water replenishment, brick wall sealing (5) and back-filtration drainage pipe (7) construction work is carried out until all brick wall sealing (5) and back-filtration drainage pipe (7) construction is completed; 6) manually entering the jacking pipe (3) from the upstream end thereof and installing a blind plate (9) at the end of the jacking pipe (3); 7) Remove the jacking head (4) at the end of the jacking pipe (3) and hoist it out of the receiving well (1); 8) Carry out the construction of planting reinforcement (8) and reinforced concrete plugging (6) in the receiving well (1); 9) After the reinforced concrete plug (6) solidifies, the remaining mud in the receiving well (1) is discharged using a mud pump (11) and the blind plate (9) is removed.

2. The sand blocking and water stopping structure for the jacking pipe receiving well opening according to claim 1, characterized in that: The brick wall plug (5) and the reinforced concrete plug (6) are both arranged in a ring shape around the top pipe (3) at the opening (2).

3. The sand blocking and water stopping structure for the jacking pipe receiving well opening according to claim 1, characterized in that: The embedded reinforcement (8) is pre-buried in a double row in an annular direction on the side wall of the opening (2) of the receiving well (1).

4. The sand blocking and water stopping structure for the jacking pipe receiving well opening according to claim 1, characterized in that: The reverse filtration drainage pipe (7) is filled with graded gravel.

5. The sand blocking and water stopping structure for the jacking pipe receiving well opening according to claim 1 is characterized in that: In the step 1), the blind plate (9) is pre-installed on the end of the jacking pipe (3) before it is pushed into the hole (2), thereby eliminating the operation of manually installing the blind plate (9) in step 6).

6. The sand blocking and water stopping structure for the jacking pipe receiving well opening according to claim 1, characterized in that: In the step 9), the sealing performance of the reinforced concrete plug (6) is pre-checked before removing the blind plate (9), and the blind plate (9) is removed while ensuring that the sealing performance of the reinforced concrete plug (6) is good.

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