Pile foundation construction equipment and construction method close to an existing tunnel

Abstract

The invention relates to the field of construction engineering, and discloses a pile foundation construction device and a construction method thereof adjacent to an existing tunnel, wherein the pile foundation construction device adjacent to an existing tunnel comprises a mobile rotary drilling mechanism for drilling pile holes, a spliced ​​casing inserted in the pile hole, a borehole bottom detection mechanism detachably connected to the bottom end of the spliced ​​casing, and a rotating mechanism for rotating the spliced ​​casing; the invention can detect large rocks appearing in the pile hole drilling process in real time through the borehole bottom detection mechanism, and can effectively reduce the collision damage of the casing directly inserted into the ground under strong pressure with the large rocks; the borehole bottom detection mechanism can be clamped on the large rocks during the contact process, and generate tangential force through rotational motion to squeeze the large rocks to the outside of the borehole bottom detection mechanism, thereby effectively improving the drilling efficiency.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and more particularly to a pile foundation construction device and a construction method thereof close to an existing tunnel. Background Art

[0002] With the construction of intercity railways and passenger dedicated lines, due to the high requirements of high-speed train operation on the smoothness of railway lines, a large number of line roadbeds are replaced by viaducts, which has resulted in bridge-type railway passenger stations with arrival and departure platforms located on bridge structures. Among them, the main body of the station building (including waiting halls, ticket halls and other main spaces) is located directly under the bridge and the line, which is called a line-under-bridge-type station. The line-under-bridge-type station has the characteristics of saving land, compact functional layout, convenient passenger flow, and simple volume. With the further acceleration of the current scientific and technological development, the design of station engineering often has to meet the principles of functionality, systematization, advancement, culture, and economy. The construction technology of railway station buildings is also being further developed and innovated, and there is a trend that station buildings integrate taxis, buses, rail transit, and railways.

[0003] How to ensure the safety of subway operations, through the selection of pile foundation construction technology for new station buildings on both sides of the subway line, and rationally optimize the overall construction organization arrangement of the foundation to minimize the impact on the subway structure and ensure the smooth construction of the station building has become the top priority of the project of building station buildings on the subway.

[0004] Before the pile foundation construction, trial drilling construction was first carried out on the pile foundations on both sides of the subway line. During the construction, 2.5m long steel casings were buried. It was found that the backfill soil on both sides of the original subway line was miscellaneous fill soil. Not only was the soil quality poor, but there were also many large rocks and garbage. In the actual drilling process, rocks fell from the hole wall and the lower part of the casing collapsed. The rocks falling from the hole wall can easily cause the drill bit to be stuck, which greatly affects the efficiency of the pile foundation construction and easily causes damage to the drilling equipment. Therefore, spliced ​​casings are used to continuously lengthen the casing length to adapt to the drilling process of the drill bit. However, the casing is easily blocked by large rocks during the downward pressure process of the drill bit. If C20 concrete is used to be refilled between the bottom of the casing and the bottom rock layer, and drilling is performed after the concrete strength is increased, it will take a long time, which greatly affects the drilling efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a pile foundation construction device and a construction method thereof adjacent to an existing tunnel in order to solve the above-mentioned problem.

[0006] The present invention provides a pile foundation construction device close to an existing tunnel, comprising a mobile rotary drilling mechanism for drilling a pile hole, a spliced ​​casing inserted in the pile hole, a drilling bottom detection mechanism detachably connected to the bottom end of the spliced ​​casing, and a rotating mechanism for rotating the spliced ​​casing;

[0007] The spliced ​​casing includes a plurality of short casings connected end to end in sequence and a reinforcing ring connected to the outer wall of the short casing, a plurality of reinforcing rib insertion rods are connected to the reinforcing ring located at the bottom of the pile hole, and the plurality of reinforcing rib insertion rods are detachably connected to the detection mechanism at the bottom of the borehole;

[0008] The borehole bottom detection mechanism includes an elastic telescopic connection mechanism detachably connected to the bottom end of the spliced ​​casing, a spliced ​​contact mechanism detachably connected to the bottom end of the elastic telescopic connection mechanism, and an auxiliary connection reinforcement mechanism connected to the outer wall of the spliced ​​contact mechanism;

[0009] The elastic telescopic connection mechanism includes an elastic telescopic connection component and a plurality of resistance measuring components connected between the elastic telescopic connection component and the spliced ​​contact mechanism;

[0010] The spliced ​​contact mechanism includes a plurality of arc-shaped contact components, which are distributed in a circumferential manner and are connected to each other by longitudinal sliding, and a plurality of resistance measuring components are detachably connected to the corresponding arc-shaped contact components, and the resistance measuring components are used to obtain the resistance value of the arc-shaped contact component when it moves down along the pile hole;

[0011] The auxiliary reinforcement mechanism includes a spliced ​​reinforcement assembly, and several of the reinforcement rib rods are detachably connected to the spliced ​​reinforcement assembly. When the spliced ​​reinforcement assembly and the several reinforcement rib rods are in a connected state, the spliced ​​casing, the elastic telescopic connection mechanism, the spliced ​​contact mechanism and the auxiliary reinforcement mechanism are all in a coaxial state.

[0012] As a further optimization scheme of the present invention, the elastic telescopic connection assembly includes a circular connecting plate connected to the bottom end of the short protective tube, an outer telescopic protective tube connected to the bottom end of the circular connecting plate, an inner telescopic protective tube, a plurality of multi-section telescopic rods and a plurality of springs, and a plurality of arc connecting plates arranged parallel to the circular connecting plate, a plurality of the arc connecting plates are distributed in a circular manner, and a plurality of the arc connecting plates are fixedly connected to the outer telescopic protective tube and the inner telescopic protective tube, a plurality of the arc connecting plates can be detachably connected to the corresponding arc contact assemblies, and the arc connecting plates are provided with through holes for the multi-section telescopic rods and springs to pass through, a plurality of springs are respectively sleeved on the outside of the corresponding multi-section telescopic rods, and one end of the multi-section telescopic rod and one end of the spring are connected to the corresponding resistance measuring assembly.

[0013] As a further optimization scheme of the present invention, the resistance measuring component includes a pressure sensor and an integrated information transmission module connected to the pressure sensor, one end of the multi-section telescopic rod and one end of the spring are both connected to the pressure sensor, and the arc touch component is provided with a accommodating groove for accommodating the pressure sensor and the integrated information transmission module.

[0014] As a further optimization scheme of the present invention, the arc-shaped contact assembly includes a plurality of arc-shaped splicing plates and an arc-shaped limiting strip connected to one side wall of the arc-shaped splicing plate. The other side wall of the arc-shaped splicing plate is provided with an arc-shaped limiting groove matching the arc-shaped limiting strip. The accommodating groove is provided at the top of the arc-shaped splicing plate, and the arc-shaped connecting plate is detachably connected to the arc-shaped splicing plate.

[0015] As a further optimization scheme of the present invention, the spliced ​​reinforcement assembly includes a plurality of arc-shaped reinforcement plates and a plurality of sockets arranged at the top of the arc-shaped reinforcement plates. The arc-shaped reinforcement plates are fixedly connected to the outer arc surface of the arc-shaped splicing plates, and the distance between the top of the arc-shaped reinforcement plates and the bottom end of the short casing is smaller than the distance between the top of the arc-shaped splicing plates and the bottom end of the short casing.

[0016] As a further optimization solution of the present invention, an expansion type support mechanism is connected to the outer wall of the spliced ​​contact mechanism, and the expansion type support mechanism is located below the auxiliary reinforcement mechanism.

[0017] As a further optimization solution of the present invention, the expandable support mechanism includes a spliced ​​position limiting protection component and an expandable support component connected to the spliced ​​position limiting protection component, and the expandable support component is connected to an external pump body.

[0018] As a further optimization scheme of the present invention, the spliced ​​limit protection assembly includes a plurality of C-shaped arc plates, which are respectively connected to the outer arc surfaces of the corresponding arc splicing plates, and the C-shaped arc plates are located below the arc reinforcing plates.

[0019] As a further optimization scheme of the present invention, the expandable support assembly includes an expandable bladder and a connecting tube connected to the inner arc surface of one of the arc-shaped splicing plates. Several C-shaped arc-shaped plates are connected to the expandable bladder. One end of the connecting tube passes through the arc-shaped splicing plate and the C-shaped arc-shaped plate in sequence and then communicates with the internal space of the expandable bladder.

[0020] A method for constructing a pile foundation adjacent to an existing tunnel, using the above-mentioned pile foundation construction equipment adjacent to an existing tunnel, comprises the following steps:

[0021] Level the site and connect the top of the elastic telescopic connection mechanism to the corresponding short casing;

[0022] A short casing connected to the entire bottom detection mechanism of the borehole is buried, so that the mobile rotary drilling mechanism is aligned with the middle area of ​​the short casing to be drilled;

[0023] Along with the drilling process of the mobile rotary drilling mechanism, the short casing is pressed down by the mobile rotary drilling mechanism. When the height of the short casing exposed above the ground is lower than the set value, a new short casing is spliced ​​with the previous short casing through welding technology, and a reinforcing ring body is welded on the outside of the short casing, and the reinforcing ring body is distributed at a set interval distance;

[0024] During the drilling process of the mobile rotary drilling mechanism, the resistance value of the arc touch component is detected in real time by the resistance measuring component. When the resistance value of one or more arc touch components is gradually greater than that of the remaining arc touch components, the rotating mechanism is sleeved on the outside of the short casing located on the ground, and then the short casing is clamped and rotated until the resistance value of one or more arc touch components is gradually reduced and is the same as the resistance value of the remaining arc touch components, and the drilling process of the mobile rotary drilling mechanism is continued.

[0025] The beneficial effects of the present invention are as follows: the present invention can detect large rocks appearing in the pile hole drilling process in real time through the borehole bottom detection mechanism, which can effectively reduce the collision damage of the casing with the large rocks when it is directly inserted into the ground under strong pressure, and the borehole bottom detection mechanism can be stuck on the large rocks during the contact process, and generate tangential force through rotational motion to squeeze the large rocks to the outside of the borehole bottom detection mechanism, thereby effectively improving the drilling efficiency, and when the borehole bottom collapses due to loose soil, it can be expanded and bulged by the expansion support mechanism and the collapsed part can be filled and supported, which can effectively reduce the degree of collapse and facilitate the subsequent backfilling of concrete treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the borehole bottom detection mechanism of the present invention;

[0028] Figure 3 The present invention Figure 2 Magnified view at A in the middle;

[0029] Figure 4 The present invention Figure 2 Magnified view at B in the middle;

[0030] Figure 5 The present invention Figure 2 Enlarged view at center C;

[0031] Figure 6 It is a view of the cooperation between the borehole bottom detection mechanism and the spliced ​​casing of the present invention;

[0032] Figure 7 The present invention Figure 6 Magnified view at D in the middle;

[0033] Figure 8 The present invention Figure 2 Enlarged view at E in the middle;

[0034] Fig. 9 It is a schematic diagram of the process of rotating the bottom detection mechanism of the borehole to remove large stones.

[0035] In the figure: 1. mobile body; 2. hydraulic angle adjustment mechanism; 3. multifunctional slide rail; 4. traction mechanism; 5. drill rod; 6. power mechanism; 7. drill bit; 8. spliced ​​casing; 801. reinforcing ring body; 802. reinforcing rib insertion rod; 9. drilling bottom detection mechanism; 91. elastic telescopic connection mechanism; 9101. arc connection plate; 9102. multi-section telescopic rod; 9103. circular connection plate; 9104. external telescopic protection tube; 9105. internal telescopic protection Tube; 9106, spring; 9107, pressure sensor; 9108, integrated information transmission module; 92, spliced ​​touch mechanism; 9201, arc splicing plate; 9202, arc limiting strip; 9203, arc limiting slide; 93, expandable support mechanism; 9301, C-shaped arc plate; 9302, expandable bladder; 9303, connecting tube; 94, auxiliary reinforcement mechanism; 9401, arc reinforcing plate; 9402, jack; 10, rotating mechanism. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only intended to enable those skilled in the art to better understand and implement the subject matter described herein. In addition, the features described relative to some examples may also be combined in other examples.

[0037] Example 1

[0038] like Figure 1-Figure 8As shown, a pile foundation construction equipment adjacent to an existing tunnel comprises a mobile rotary drilling mechanism for drilling pile holes, a spliced ​​casing 8 inserted in the pile hole, a borehole bottom detection mechanism 9 detachably connected to the bottom end of the spliced ​​casing 8, and a rotating mechanism 10 for rotating the spliced ​​casing 8; the mobile rotary drilling mechanism is a rotary drilling rig, comprising a mobile body 1, a hydraulic angle adjustment mechanism 2 connected to the mobile body 1, a multifunctional slide rail 3 connected to the hydraulic angle adjustment mechanism 2, a traction mechanism 4 connected to the mobile body 1, a power mechanism 6 connected to the multifunctional slide rail 3, a drill rod 5 connected to one end of the traction mechanism 4, and a drill bit 7 connected to the drill rod 5, the power mechanism 6 cooperates with the drill rod 5, the rotary drilling rig is a prior art, and the specific working principle and detailed structure of each component thereof are not repeated here; and the working principle of the rotating mechanism 10 is the same as the power mechanism 6 for driving the drill rod 5 to rotate, and both are prior art, and are not repeated here;

[0039] The spliced ​​casing 8 includes a plurality of short casings connected end to end in sequence and a reinforcing ring 801 connected to the outer wall of the short casing. A plurality of reinforcing ribs 802 are connected to the reinforcing ring 801 located at the bottom of the pile hole. The plurality of reinforcing ribs 802 are detachably connected to the detection mechanism 9 at the bottom of the borehole.

[0040] The borehole bottom detection mechanism 9 includes an elastic telescopic connection mechanism 91 detachably connected to the bottom end of the spliced ​​casing 8, a spliced ​​contact mechanism 92 detachably connected to the bottom end of the elastic telescopic connection mechanism 91, and an auxiliary connection reinforcement mechanism 94 connected to the outer wall of the spliced ​​contact mechanism 92;

[0041] The elastic telescopic connection mechanism 91 includes an elastic telescopic connection component and a plurality of resistance measuring components connected between the elastic telescopic connection component and the spliced ​​contact mechanism 92;

[0042] The spliced ​​contact mechanism 92 includes a plurality of arc-shaped contact components, which are distributed in a circumferential manner and are slidably connected to each other in the longitudinal direction. A plurality of resistance measuring components are detachably connected to the corresponding arc-shaped contact components, and the resistance measuring components are used to obtain the resistance value of the arc-shaped contact component when it moves down along the pile hole.

[0043] The auxiliary reinforcement mechanism 94 includes a spliced ​​reinforcement assembly, and a plurality of reinforcement rib inserts 802 are detachably connected to the spliced ​​reinforcement assembly. When the spliced ​​reinforcement assembly and the plurality of reinforcement rib inserts 802 are in a connected state, the spliced ​​casing 8, the elastic telescopic connection mechanism 91, the spliced ​​contact mechanism 92 and the auxiliary reinforcement mechanism 94 are all in a coaxial state.

[0044] It should be noted that when constructing a pile foundation adjacent to an existing tunnel, the site is first leveled, and the top of the elastic telescopic connection mechanism 91 is connected to the corresponding short casing;

[0045] A short casing connected to the entire borehole bottom detection mechanism 9 is buried, so that the mobile rotary drilling mechanism is aligned with the middle area of ​​the short casing to be drilled;

[0046] Along with the drilling process of the mobile rotary drilling mechanism, the short casing is pressed down by the mobile rotary drilling mechanism. When the height of the short casing exposed above the ground is lower than the set value, a new short casing is spliced ​​with the previous short casing by welding technology, and a reinforcing ring body 801 is welded on the outside of the short casing. The reinforcing ring bodies 801 are distributed at a set interval distance.

[0047] During the drilling process of the mobile rotary drilling mechanism, the resistance value of the arc touch component is detected in real time by the resistance measuring component. When the resistance value of one or more arc touch components is gradually greater than that of the remaining arc touch components, it means that large stones appear on the path of the casing moving downward, and the movement of one or more arc touch components is blocked. The bottom end of the arc touch component contacts the large stone and a contact arc similar to an arc appears due to the shape of the large stone. The arc touch component that contacts the topmost position of the large stone has the earliest blocked time point and its position is at the highest position. The contact assembly can drag several arc-shaped contact assemblies adjacent to it in sequence through the connection relationship of the elastic telescopic connection assembly, so as to form an arc-shaped gap, which is clamped on the large stone through the gap, and is sleeved on the outside of the short casing located on the ground through the rotating mechanism 10, and then the short casing is clamped and rotated. When the short casing rotates, all the arc-shaped contact assemblies can be driven to rotate in the same direction and angle, and the arc-shaped contact assembly that is in contact with the side of the large stone and is not hindered by the stroke can provide tangential force to the large stone in the rotating state, so that the stone moves in the direction of the tangential force, as shown in the specific example. Fig. 9 As shown, the part embedded in the external soil begins to loosen, and under the action of the tangential force, rotates outside the circular range covered by the short casing until the entire large stone is moved out of the short casing coverage area. During this process, the resistance value of the arc-shaped touch component that was previously in contact with the large stone gradually decreases, and when it is the same as the resistance value of the remaining arc-shaped touch components, it means that the large stone is removed from the downward movement path of the short casing, and the drilling process of the mobile rotary drilling mechanism can continue at this time;

[0048] After the drilling is completed, the supervision engineer will conduct a hole test, clean the hole after the test, and place the steel frame after cleaning. After the steel frame is placed, the guide tube is placed and underwater concrete is poured. When the initial setting occurs, the steel casing is removed. After the concrete solidifies, the pile head is processed and the pile test is carried out.

[0049] Among them, Figure 2 , Figure 3 , Figure 4 As shown, the elastic telescopic connection assembly includes a circular connecting plate 9103 connected to the bottom end of the short casing, an outer telescopic protection tube 9104 connected to the bottom end of the circular connecting plate 9103, an inner telescopic protection tube 9105, a plurality of multi-section telescopic rods 9102 and a plurality of springs 9106, and a plurality of arc connecting plates 9101 arranged parallel to the circular connecting plate 9103. The plurality of arc connecting plates 9101 are distributed in a circular manner, and the plurality of arc connecting plates 9101 are connected to the outer telescopic protection tube 9104 and the inner telescopic protection tube 9105. The protective tube 9104 and the inner telescopic protective tube 9105 are fixedly connected, and a plurality of arc-shaped connecting plates 9101 can be detachably connected to the corresponding arc-shaped contact components, and the arc-shaped connecting plates 9101 are provided with through holes for the multi-section telescopic rod 9102 and the spring 9106 to pass through, and a plurality of springs 9106 are respectively sleeved on the outside of the corresponding multi-section telescopic rod 9102, and one end of the multi-section telescopic rod 9102 and one end of the spring 9106 are connected to the corresponding resistance measuring components.

[0050] It should be noted that the outer telescopic protective tube 9104 and the inner telescopic protective tube 9105 have a certain deformation ability and can adapt to the sliding state between the multiple arc-shaped touch components. When the multiple arc-shaped touch components are subjected to the same resistance, the corresponding multi-section telescopic rod 9102 and spring 9106 have the same deformation amount, and the elastic force of the spring 9106 is equal to the resistance of the arc-shaped touch component. At this time, the multiple arc-shaped touch components, the multi-section telescopic rod 9102 and the spring 9106 are equivalent to a stable whole. The thrust provided by the short protective tube can push the arc-shaped touch components. The arc-shaped touch assembly moves downward, and when the resistance experienced by one or more of the arc-shaped touch assemblies gradually increases, it means that these arc-shaped touch assemblies have come into contact with large hard stones, which results in an increase in the resistance experienced by the arc-shaped touch assemblies. The corresponding multi-section telescopic rod 9102 and spring 9106 are further compressed, the elastic force increases, and the pressure transmitted to the resistance measuring assembly increases, so that the downward movement status of the arc-shaped touch assembly can be obtained in real time, the downward pressure of the short casing can be stopped in time, and the rotating mechanism 10 is used to rotate the short casing, so as to remove the large stones from the moving path of the short casing.

[0051] Among them, Figure 3 and Figure 7 As shown, the resistance measuring component includes a pressure sensor 9107 and an integrated information transmission module 9108 connected to the pressure sensor 9107, one end of the multi-section telescopic rod 9102 and one end of the spring 9106 are both connected to the pressure sensor 9107, and a receiving groove for accommodating the pressure sensor 9107 and the integrated information transmission module 9108 is provided on the arc touch component.

[0052] It should be noted that, as mentioned above, when the multi-section telescopic rod 9102 and the spring 9106 are deformed and shortened, the elastic force generated by the spring 9106 is applied to the pressure sensor 9107. The pressure sensor 9107 can detect the change of the elastic force in real time and transmit the change value data to the integrated information transmission module 9108. The integrated information transmission module 9108 includes a power supply, a chip and a wireless transmission module, which can transmit the pressure changes detected by the pressure sensor 9107 to the operation terminal in real time, thereby providing the staff with real-time drilling status of the bottom of the borehole.

[0053] Among them, Figure 2 and Figure 3 As shown, the arc-shaped contact assembly includes a plurality of arc-shaped splicing plates 9201, an arc-shaped limiting strip plate 9202 connected to one side wall of the arc-shaped splicing plate 9201, an arc-shaped limiting slide groove 9203 matching the arc-shaped limiting strip plate 9202 is provided on the other side wall of the arc-shaped splicing plate 9201, the accommodating groove is provided at the top of the arc-shaped splicing plate 9201, and the arc-shaped connecting plate 9101 is detachably connected to the arc-shaped splicing plate 9201.

[0054] It should be noted that, as mentioned above, when the travel of one or more arc-shaped splicing plates 9201 is blocked, the unobstructed arc-shaped splicing plates 9201 continue to move downward, and the arc-shaped limiting strips 9202 of the obstructed arc-shaped splicing plates 9201 gradually slide out from the arc-shaped limiting slide grooves 9203 on the unobstructed arc-shaped splicing plates 9201, and are higher than the top height of the unobstructed arc-shaped splicing plates 9201. When the arc-shaped splicing plates 9201 are subjected to the same force, all the arc-shaped splicing plates 9201 can be spliced ​​into a complete cylinder, which is equivalent to a short casing, and can provide protection for the drill bit 7 and the already formed pile hole, and can effectively prevent stones on the hole wall from falling off and onto the drill bit 7, thereby effectively preventing the occurrence of drill jamming.

[0055] Among them, Figure 2 , Figure 3 and Figure 7 As shown, the spliced ​​reinforcement assembly includes a plurality of arc-shaped reinforcement plates 9401 and a plurality of sockets 9402 arranged at the top of the arc-shaped reinforcement plates 9401. The arc-shaped reinforcement plates 9401 are fixedly connected to the outer arc surface of the arc-shaped splicing plate 9201, and the distance between the top of the arc-shaped reinforcement plate 9401 and the bottom end of the short casing is smaller than the distance between the top of the arc-shaped splicing plate 9201 and the bottom end of the short casing.

[0056] It should be noted that, as mentioned above, since only the multi-section telescopic rod 9102 in the elastic telescopic connection assembly provides a stable connection support force, as the spring 9106, the outer telescopic bellows and the inner telescopic bellows all have a certain deformation capacity, in order to improve the connection strength between the short casing and the entire splicing type contact mechanism 92, a plurality of sets of reinforcing rib plug rods 802 are added. After the reinforcing rib plug rods 802 are inserted into the socket 9402 on the arc-shaped reinforcing plate 9401, the connection strength between the short casing and the arc-shaped splicing plate 9201 can be effectively improved. When the spring 9106 is not stretched to the set length, under the action of the gravity of the arc-shaped splicing plate 9201 alone, the length of the spring 9106 cannot reach the set stretching length. Therefore, the reinforcing rib plug rod 802 can always be inserted in the socket 9402.

[0057] Example 2

[0058] Based on embodiment 1, an expandable support mechanism 93 is also included, wherein Figure 2 , Figure 5 , Figure 6 and Figure 8 As shown, the expandable support mechanism 93 is connected to the outer wall of the splicing type contact mechanism 92 , and the expandable support mechanism 93 is located below the auxiliary reinforcement mechanism 94 .

[0059] The expandable support mechanism 93 includes a spliced ​​position limiting protection component and an expandable support component connected to the spliced ​​position limiting protection component, and the expandable support component is connected to an external pump body.

[0060] The spliced ​​limiting protection assembly includes a plurality of C-shaped arc plates 9301 , which are respectively connected to the outer arc surfaces of the corresponding arc splicing plates 9201 , and the C-shaped arc plates 9301 are located below the arc reinforcing plates 9401 .

[0061] The expandable support assembly includes an expandable bladder 9302 and a connecting tube 9303 connected to the inner arc surface of one of the arc-shaped splicing plates 9201. Several C-shaped arc-shaped plates 9301 are connected to the expandable bladder 9302. One end of the connecting tube 9303 passes through the arc-shaped splicing plate 9201 and the C-shaped arc-shaped plate 9301 in sequence and then communicates with the internal space of the expandable bladder 9302.

[0062] It should be noted that, during the drilling process, in addition to the stones that hinder the drilling process as in Example 1, there is another situation that needs to be dealt with. Specifically, during the drilling process, the soil at the bottom of the borehole becomes loose and collapses due to the abundance of groundwater. At this time, the arc-shaped connecting plate 9101 is equivalent to no obstruction, and the spring 9106 is reset. The pressure sensor 9107 can detect in real time that the resistance is greatly reduced, indicating that the bottom has collapsed. At this time, in order to prevent the further expansion of the collapse, the external pump body can be used to inject liquid or gas with a set pressure into the expandable bladder 9302 through the connecting pipe 9303, so that the expandable bladder 9302 expands and bulges at the collapsed position, thereby filling the surrounding collapsed area and providing a set support force, which can effectively It prevents the collapse area from further expanding, reduces the difficulty of subsequent treatment and the consumption of reinjected concrete. When the reinjected concrete is initially solidified, the liquid or gas in the expandable bladder 9302 is extracted, so that the expandable bladder 9302 can shrink again and exist in the C-shaped annular containment structure formed by the splicing of C-shaped arc plates 9301. The protection of the expandable bladder 9302 can be effectively improved, that is, during the downward movement, the friction force caused by the external soil on the expandable bladder 9302 is reduced, so that the expandable bladder 9302 can be stably connected in the C-shaped annular containment structure. It should be noted that a hose is connected between the connecting pipe 9303 and the pump body. The connecting pipe 9303 and the hose have a certain wear-resistant effect and will not directly contact the drill bit 7.

[0063] The present embodiment is described above, but the present embodiment is not limited to the above-mentioned specific implementation manner. The above-mentioned specific implementation manner is merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, which are all within the protection of the present embodiment.

Claims

1. A pile foundation construction device adjacent to an existing tunnel, characterized in that: It comprises a mobile rotary drilling mechanism for drilling a pile hole, a spliced ​​casing (8) inserted in the pile hole, a borehole bottom detection mechanism (9) detachably connected to the bottom end of the spliced ​​casing (8), and a rotating mechanism (10) for rotating the spliced ​​casing (8); The spliced ​​casing (8) comprises a plurality of short casings connected end to end in sequence and a reinforcing ring body (801) connected to the outer wall of the short casing, a plurality of reinforcing rib insertion rods (802) are connected to the reinforcing ring body (801) located at the bottom of the pile hole, and the plurality of reinforcing rib insertion rods (802) are detachably connected to the borehole bottom detection mechanism (9); The borehole bottom detection mechanism (9) comprises an elastic telescopic connection mechanism (91) detachably connected to the bottom end of the spliced ​​casing (8), a spliced ​​contact mechanism (92) detachably connected to the bottom end of the elastic telescopic connection mechanism (91), and an auxiliary connection reinforcement mechanism (94) connected to the outer wall of the spliced ​​contact mechanism (92); The elastic telescopic connection mechanism (91) comprises an elastic telescopic connection component and a plurality of resistance measuring components connected between the elastic telescopic connection component and the spliced ​​contact mechanism (92); The spliced ​​contact mechanism (92) comprises a plurality of arc-shaped contact components, the plurality of arc-shaped contact components are distributed in a circular pattern, and the plurality of arc-shaped contact components are connected to each other in a longitudinal sliding manner, and a plurality of resistance measuring components are detachably connected to the correspondingly arranged arc-shaped contact components, and the resistance measuring components are used to obtain the resistance value encountered by the arc-shaped contact components when they move downward along the pile hole; The auxiliary reinforcement mechanism (94) includes a spliced ​​reinforcement assembly, and a plurality of the reinforcement rib insert rods (802) are detachably connected to the spliced ​​reinforcement assembly. When the spliced ​​reinforcement assembly and the plurality of reinforcement rib insert rods (802) are in a connected state, the spliced ​​casing (8), the elastic telescopic connection mechanism (91), the spliced ​​contact mechanism (92) and the auxiliary reinforcement mechanism (94) are all in a coaxial state.

2. The pile foundation construction equipment close to an existing tunnel according to claim 1, characterized in that: The elastic telescopic connection assembly comprises a circular connecting plate (9103) connected to the bottom end of the short casing, an outer telescopic protection tube (9104) connected to the bottom end of the circular connecting plate (9103), an inner telescopic protection tube (9105), a plurality of multi-section telescopic rods (9102) and a plurality of springs (9106), and a plurality of arc connecting plates (9101) arranged parallel to the circular connecting plate (9103), wherein the plurality of arc connecting plates (9101) are distributed in a circular manner, and the plurality of arc connecting plates (9101) are connected to the outer telescopic protection tube (9104) and the inner telescopic protection tube (9105). The protective tube (9104) and the inner telescopic protective tube (9105) are fixedly connected, and a plurality of arc-shaped connecting plates (9101) can be detachably connected to the corresponding arc-shaped contact components, and the arc-shaped connecting plates (9101) are provided with through holes for the multi-section telescopic rod (9102) and the spring (9106) to pass through, and a plurality of springs (9106) are respectively sleeved on the outside of the corresponding multi-section telescopic rod (9102), and one end of the multi-section telescopic rod (9102) and one end of the spring (9106) are connected to the corresponding resistance measuring component.

3. The pile foundation construction equipment close to an existing tunnel according to claim 2, characterized in that: The resistance measuring component includes a pressure sensor (9107) and an integrated information transmission module (9108) connected to the pressure sensor (9107), one end of the multi-section telescopic rod (9102) and one end of the spring (9106) are both connected to the pressure sensor (9107), and a receiving groove for receiving the pressure sensor (9107) and the integrated information transmission module (9108) is provided on the arc-shaped touch component.

4. The pile foundation construction equipment close to an existing tunnel according to claim 3, characterized in that: The arc-shaped contact assembly comprises a plurality of arc-shaped splicing plates (9201), an arc-shaped limiting strip plate (9202) connected to one side wall of the arc-shaped splicing plate (9201), an arc-shaped limiting sliding groove (9203) matching the arc-shaped limiting strip plate (9202) is provided on the other side wall of the arc-shaped splicing plate (9201), the receiving groove is provided at the top end of the arc-shaped splicing plate (9201), and the arc-shaped connecting plate (9101) is detachably connected to the arc-shaped splicing plate (9201).

5. The pile foundation construction equipment close to an existing tunnel according to claim 4, characterized in that: The spliced ​​reinforcement assembly includes a plurality of arc-shaped reinforcement plates (9401) and a plurality of jacks (9402) arranged at the top of the arc-shaped reinforcement plates (9401). The arc-shaped reinforcement plates (9401) are fixedly connected to the outer arc surface of the arc-shaped splicing plate (9201), and the distance between the top of the arc-shaped reinforcement plate (9401) and the bottom of the short casing is smaller than the distance between the top of the arc-shaped splicing plate (9201) and the bottom of the short casing.

6. The pile foundation construction equipment close to an existing tunnel according to claim 5, characterized in that: An expansion type support mechanism (93) is connected to the outer wall of the spliced ​​contact mechanism (92), and the expansion type support mechanism (93) is located below the auxiliary reinforcement mechanism (94).

7. The pile foundation construction equipment close to an existing tunnel according to claim 6, characterized in that: The expandable support mechanism (93) comprises a spliced ​​position limiting protection component and an expandable support component connected to the spliced ​​position limiting protection component, and the expandable support component is connected to an external pump body.

8. The pile foundation construction equipment close to an existing tunnel according to claim 7, characterized in that: The spliced ​​limiting protection assembly comprises a plurality of C-shaped arc plates (9301), wherein the plurality of C-shaped arc plates (9301) are respectively connected to the outer arc surfaces of the corresponding arc spliced ​​plates (9201), and the C-shaped arc plates (9301) are located below the arc reinforcing plates (9401).

9. The pile foundation construction equipment close to an existing tunnel according to claim 8, characterized in that: The expandable support assembly includes an expandable bladder (9302) and a connecting tube (9303) connected to the inner arc surface of one of the arc-shaped splicing plates (9201), and a plurality of C-shaped arc-shaped plates (9301) are connected to the expandable bladder (9302). One end of the connecting tube (9303) passes through the arc-shaped splicing plate (9201) and the C-shaped arc-shaped plate (9301) in sequence and then communicates with the internal space of the expandable bladder (9302).

10. A pile foundation construction method adjacent to an existing tunnel, characterized in that: Using the pile foundation construction equipment adjacent to an existing tunnel as described in any one of claims 1 to 9 comprises the following steps: Leveling the site, connecting the top end of the elastic telescopic connection mechanism (91) to the corresponding short casing; A short casing connected to the entire borehole bottom detection mechanism (9) is buried, so that the mobile rotary drilling mechanism is aligned with the middle area of ​​the short casing to be drilled to perform drilling processing; As the mobile rotary drilling mechanism is drilling, the short casing is pressed down by the mobile rotary drilling mechanism. When the height of the short casing exposed above the ground is lower than a set value, a new short casing is spliced ​​onto the previous short casing by a welding process, and a reinforcing ring body (801) is welded on the outside of the short casing. The reinforcing ring bodies (801) are distributed at a set interval. During the drilling process of the mobile rotary drilling mechanism, the resistance value of the arc-shaped touch components is detected in real time by a resistance measuring component. When the resistance value of one or more arc-shaped touch components gradually becomes greater than that of the remaining arc-shaped touch components, a rotating mechanism (10) is sleeved on the outside of a short casing located on the ground, and then the short casing is clamped and rotated until the resistance value of one or more arc-shaped touch components gradually decreases and becomes the same as that of the remaining arc-shaped touch components, and the drilling process of the mobile rotary drilling mechanism is continued.

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