Miniature steel pipe pile construction device suitable for weak soil

Abstract

The utility model provides a miniature steel pipe pile construction device suitable for weak soil. The miniature steel pipe pile construction device comprises a steel sheet pile machine, a connecting part, a steel chisel, a steel pipe and a fixing lasso. The steel sheet pile machine is a pile machine which retains a steel sheet pile machine crawler, a big arm driving assembly and a big arm; the steel chisel is fixedly connected with the acting surface at the front end of the big arm through the connecting part; the steel chisel is sleeved with the steel pipe, the top end of the steel pipe abuts against the steel chisel through a fixing lasso and is fixed to the front end of the large arm in an unbinding mode, and the steel pipe and the steel chisel are coaxially arranged. In an operation state, the steel chisel and the steel pipe are kept in a vertical state by controlling the angle of the large arm. The construction device has the advantages of being convenient to pass, high in operation flexibility and high in miniature steel pipe pile construction efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe pile construction, and specifically, to a construction device for micro steel pipe piles applicable to weak soil masses. Background Technique

[0002] A micro steel pipe pile generally refers to a pile body with a size less than 400 mm and a length-diameter ratio greater than 30.

[0003] Currently, the existing technology for micro steel pipe pile construction is the process of drilling rig positioning → pilot hole drilling → casing manufacturing and burying → drilling rig hole forming → steel pipe installation construction.

[0004] Although the size of the micro steel pipe pile is small, it still relies on the supporting construction of medium and large-sized pile rigs at present. Such pile rigs are highly specialized but have poor passability. Due to the large number of micro steel pipe piles and the lack of openness in some positions, there will be obstacles in using the pile rigs, resulting in low efficiency. Moreover, when constructing in weak soil masses, such as in areas with a high groundwater level or in river channels, the walking obstacles are even more aggravated.

[0005] In addition, the current construction sequence is to drill holes first and then install steel pipes. However, in weak soil mass sections, especially when constructing in areas with a high groundwater level or in river channels, the slag backflow speed at the bottom of the hole is fast, the steel pipes cannot be driven in time, and it is necessary to clean the hole multiple times and frequently, resulting in soil erosion underground and more likely causing the settlement of surrounding retaining walls and structures.

[0006] Therefore, in view of the above problems, it is necessary to provide a new construction device for micro steel pipe piles to solve the problems of passability, flexibility, and high efficiency. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a construction device for micro steel pipe piles applicable to weak soil masses, which is convenient to pass, has strong operation flexibility, and high construction efficiency for micro steel pipe piles.

[0008] To achieve the above purpose, the technical solution adopted by the utility model is: a construction device for micro steel pipe piles applicable to weak soil masses, including a steel sheet pile rig, a connecting part, a steel drill rod, a steel pipe, and a fixing sling;

[0009] The steel sheet pile rig is a pile rig retaining the crawler vehicle, the boom driving assembly, and the boom of the steel sheet pile rig;

[0010] The steel drill rod is fixedly connected to the working surface at the front end of the boom through the connecting part;

[0011] The steel pipe is sleeved outside the steel drill rod, and the top end of the steel pipe is tightly fixed to the front end of the boom through the fixing sling and can be untied, and the steel pipe and the steel drill rod are coaxially arranged;

[0012] In the working state, by controlling the boom angle, the steel drill rod and the steel pipe are kept vertical.

[0013] Preferably, the connecting part includes a steel plate welded to the front end of the boom and a drill rod connecting seat welded or bolted to the lower end of the steel plate, and the steel drill rod is fixedly welded to the drill rod connecting seat.

[0014] Preferably, several rib plates are arranged around the upper part of the steel drill rod, and the top ends of the rib plates are fixedly welded to the drill rod connecting seat or the steel plate.

[0015] Preferably, the outer diameter of the steel drill rod is 10 mm - 20 mm smaller than the inner diameter of the steel pipe.

[0016] Preferably, the bottom end of the steel drill rod extends at least 50 cm beyond the bottom end of the steel pipe.

[0017] Preferably, one end of the fixing lasso is a ring or an annular sleeve for sleeving the steel pipe, and the other end of the fixing lasso is used for bundling and fixing on the boom.

[0018] Preferably, a corresponding limiting structure is arranged on the outer wall of the steel pipe corresponding to the fixing lasso.

[0019] Preferably, the bottom end of the steel drill rod is conical.

[0020] Preferably, the steel drill rod is a solid steel drill rod.

[0021] Preferably, the boom is provided with at least three movable joints.

[0022] The utility model has substantial features and progress compared with the prior art. Specifically, the utility model is modified on the basis of a steel sheet pile machine. Due to its particularity, the steel sheet pile machine uses a crawler vehicle as a mobile carrier, which is light, flexible and has strong passability, overcoming the limitations of the passability and flexibility of traditional pile drivers that rely on flat-bed loading vehicles. Moreover, the pile driving mechanism of traditional pile drivers is arranged at the center of the pile frame, while the steel sheet pile machine conducts remote operation through the boom, with lower requirements for the space where piling is carried out and greatly improved flexibility.

[0023] For the environment with weak foundation, due to the problem that the foundation is prone to collapse when drilling holes first and then burying steel pipes, the construction device is designed in a mode of synchronous treatment of drilling holes and burying pipes, which can effectively avoid the collapse problem of the foundation in the holes. Brief Description of the Drawings

[0024] Figure 1 It is the control logic diagram of the micro steel pipe pile construction device suitable for weak soil in the utility model.

[0025] In the figure: 1. Boom; 2. Steel drill rod; 3. Steel plate; 4. Drill rod connecting seat; 5. Steel pipe; 6. Fixing lasso; 7. Rib plate. Detailed Description of the Preferred Embodiments

[0026] The technical solution of the present utility model will be further described in detail through specific embodiments below.

[0027] As Figure 1 shown, a construction device for micro steel pipe piles applicable to soft soil includes a steel sheet pile machine, a connecting part, a steel drill rod, a steel pipe and a fixing lasso.

[0028] The steel sheet pile machine is a pile machine that retains the crawler vehicle of the steel sheet pile machine (not shown in the figure), the boom driving assembly and the boom 1. The crawler vehicle has strong passability, which is strong for soft soil, and the steel sheet pile machine uses the boom 1 to drive piles, which can cover more area in space and has strong flexibility. In this embodiment, the boom 1 is provided with at least three movable joints to have strong flexibility.

[0029] The steel drill rod 2 is fixedly connected to the front end working surface of the boom 1 through the connecting part. In this embodiment, the connecting part includes a steel plate 3 welded to the front end of the boom 1 and a drill rod connecting seat 4 welded or bolted to the lower end of the steel plate 3. The steel drill rod 2 is fixedly welded to the drill rod connecting seat 4.

[0030] The steel plate 3 is welded to the front end of the boom 1 as the basic structure for connecting the steel drill rod assembly. The steel drill rod 2 and the drill rod connecting seat 4 are welded to form an assembly, which can be replaced as a whole. To improve the structural strength of this assembly structure, a plurality of rib plates 7 are arranged around the upper part of the steel drill rod 2, and the top ends of the rib plates 7 are welded and fixed to the drill rod connecting seat 4 or the steel plate 3.

[0031] If the drill rod connecting seat 4 and the steel plate 3 are welded and fixed, this structure has a one-time characteristic, but has an advantage in the force conduction of firmness; if bolt connection is adopted, the replaceability and maintainability of this structure are better.

[0032] The steel pipe 5 is sleeved outside the steel drill rod 2. The top end of the steel pipe 5 is tightly fixed to the front end of the boom 1 through a fixing lasso 6 and can be untied. One end of the fixing lasso 6 is a ring or annular sleeve for sleeving the steel pipe 5, and the other end of the fixing lasso 6 is used for tying and fixing to the boom 1.

[0033] Under general circumstances, the bundling firmness between the fixing lasso 6 and the steel pipe 5 depends on the bundling pre-tightening force. The pre-tightening force is provided by friction, and the stability can be ensured by increasing the number of bundling turns. The connection with the boom only needs to surround the boom 1 and then tie and lock it. A lock or bolt-like structure can be used for locking, or it can also be locked by tying a knot. The purpose is on the one hand to ensure that the position of the steel pipe 5 is locked, and on the other hand to ensure that the top end of the steel pipe 5 abuts against the boom 1 and does not retreat during the downward drilling.

[0034] In other embodiments, to ensure the firmness of the lasso fixation, a corresponding limiting structure is provided on the outer wall of the steel pipe 5 corresponding to the fixed lasso, such as welding some small protrusions, hooks and other structures.

[0035] The steel pipe 5 and the steel drill 2 are coaxially arranged; the outer diameter of the steel drill 2 is 10 mm - 20 mm smaller than the inner diameter of the steel pipe 5, the bottom end of the steel drill 2 extends at least 50 cm beyond the bottom end of the steel pipe 5, the steel drill 2 is a solid steel drill, and the bottom end of the steel drill 2 is conical.

[0036] During the operation, by controlling the boom angle, the steel drill and the steel pipe are kept in a vertical state.

[0037] During the construction operation, the steel drill 2 is aligned with the pile position for construction, the boom 1 presses down the steel drill 2 to make a pilot hole. Since the upper part of the steel pipe 5 abuts against the steel plate 3, the steel pipe 5 sinks synchronously with the steel drill 2. After the top of the steel pipe 5 reaches the design elevation, the fixed lasso 6 is loosened, the boom 1 is lifted to take out the steel drill 2, and the steel pipe 5 remains in the hole. Then, grouting is carried out in the hole, and the construction of the steel pipe pile is completed.

[0038] Grouting is carried out by using a grouting conduit. The grouting conduit is inserted from the steel pipe to the bottom of the hole, and grouting is carried out from the upper part by using a grouting machine. After grouting, the pipe is not pulled out temporarily until the cement slurry flows out of the outside of the pipe. Then, the grouting pipe is pulled out and the end of the steel pipe is sealed, and pressure is applied for several minutes until the cement slurry flows out of the outside of the steel pipe again.

[0039] Multiple pressure groutings: Since it is difficult to obtain the required fullness coefficient by one-time grouting, the grouting pressure is 0.5 Mpa, and multiple intermittent groutings are required, generally three to five times, until the fine stone fills and turns up the slurry. The water-cement ratio is 0.5:1, the particle size of the stone is 0.5 - 1.0 cm, the cement is P.O 42.5, and the cement consumption per meter is not less than 40 kg.

[0040] Using the traditional construction process, the daily construction efficiency is about 10 piles per day. When constructing in the river channel, multiple dredging operations are required, which causes soil and water loss underground and leads to the cracking of surrounding structures. Using this construction method, the construction efficiency is about 70 piles per day, which greatly speeds up the construction speed, and no problems such as settlement and cracking occur in the surrounding structures.

[0041] Finally, it should be noted that: The above has described the preferred embodiments of this patent in detail, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of this patent.

Claims

1. A micro steel pipe pile construction device suitable for weak soil, characterized by: It includes a steel sheet pile driver, a connecting part, a steel drill, a steel pipe and a fixing lasso; The steel sheet pile driver is a pile driver that retains a steel sheet pile driver crawler, a boom drive assembly and a boom; The steel chisel is connected and fixed to the front end working surface of the boom through the connecting part; The steel pipe is sleeved outside the steel drill, the top end of the steel pipe is fixed to the front end of the boom by a fixed lasso and can be untied, and the steel pipe and the steel drill are coaxially arranged; During operation, the steel drill and steel pipe are kept vertical by controlling the angle of the boom.

2. The micro steel pipe pile construction device suitable for weak soil according to claim 1 is characterized in that: The connecting part comprises a steel plate welded to the front end of the boom and a drill rod connecting seat welded or bolted to the lower end of the steel plate, and the steel drill is welded and fixed to the drill rod connecting seat.

3. The micro steel pipe pile construction device suitable for weak soil according to claim 2 is characterized in that: A plurality of ribs are arranged around the upper part of the steel drill, and the top ends of the ribs are welded and fixed to the drill rod connecting seat or the steel plate.

4. The micro steel pipe pile construction device suitable for weak soil according to claim 1, 2 or 3, characterized in that: The outer diameter of the steel drill is between 10mm and 20mm smaller than the inner diameter of the steel pipe.

5. The micro steel pipe pile construction device suitable for weak soil according to claim 4 is characterized in that: The bottom end of the steel drill exceeds the bottom end of the steel pipe by at least 50 cm.

6. The micro steel pipe pile construction device suitable for weak soil according to claim 5 is characterized in that: One end of the fixing lasso is a ring or annular sleeve for sleeved on the steel pipe, and the other end of the fixing lasso is used for binding and fixing on the upper arm.

7. The micro steel pipe pile construction device suitable for weak soil according to claim 6 is characterized in that: A corresponding limiting structure is arranged on the outer wall of the steel pipe corresponding to the fixing lasso.

8. The micro steel pipe pile construction device suitable for weak soil according to claim 7 is characterized in that: The bottom end of the steel chisel is conical.

9. The micro steel pipe pile construction device suitable for weak soil according to claim 8, characterized in that: The steel drill is a solid steel drill.

10. The micro steel pipe pile construction device suitable for weak soil according to claim 9, characterized in that: The upper arm is provided with at least three movable joints.

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