A pile-to-pile connection

Abstract

The utility model provides a kind of inter-pile connecting structure, belong to prefabricated pile inter-pile connecting technical field, including upper pile end head plate, lower pile end head plate, several upper connecting sleeve, several lower connecting sleeve and several connecting steel bars, upper pile end head plate is installed in the lower end surface of upper section pile, lower pile end head plate is installed in the upper end surface of lower section pile, when upper section pile and lower section pile are connected together, lower section pile is fixed immovably with the posture of lower pile end head plate upwards, the upper portion of several connecting steel bars is fixedly installed in upper connecting sleeve after being penetrated through upper pile end head plate, lower connecting sleeve is injected with slurry, then by crane drives upper section pile to move downwards to make connecting steel bar penetrate lower pile end head plate and then insert into the slurry in lower connecting sleeve, until the lower end surface of upper pile end head plate and the upper end surface of lower pile end head plate are inlaid, after slurry solidifies, the fixed connection of upper section pile and lower section pile is realized.

Description

Technical Field

[0001] This utility model belongs to the field of precast pile connection technology, and in particular relates to a pile connection structure. Background Technology

[0002] In structures such as slope protection, deep foundation pit engineering, bridge foundations and port wharves, pile foundations are an important and widely used form. In order to improve the overall stability, lateral stiffness and bearing capacity of pile foundations, it is often necessary to set up connecting devices between adjacent piles to form a row or group of piles working together.

[0003] However, existing pile connections typically use channel steel, I-beams, and other steel sections as connecting beams, which are then connected to steel plates embedded in the pile body via welding or high-strength bolts. However, welded steel plates are prone to rust in humid and corrosive environments, thus failing to guarantee the long-term stability of the connection between piles. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a pile connection structure to solve the problem that the prior art cannot guarantee the long-term stability of the connection between piles.

[0005] To achieve the above and other related objectives, this utility model provides a pile-to-pile connection structure, the pile-to-pile connection structure comprising:

[0006] The upper pile end plate and several upper connecting sleeves are provided. The upper pile end plate is installed on the lower end face of the upper pile section, and several upper connecting sleeves are fixedly installed on the upper end face of the upper pile end plate. The several connecting sleeves are arranged in a circular array along the center line of the upper pile end plate.

[0007] The pile end plate and several lower connecting sleeves are provided. The several lower connecting sleeves correspond one-to-one with the several upper connecting sleeves. The pile end plate is installed on the upper end face of the pile section. The center line of the pile section coincides with the center line of the pile section. Several lower connecting sleeves are fixedly installed on the lower end face of the pile end plate. The several connecting sleeves are arranged in a circular array along the center line of the pile end plate.

[0008] A plurality of connecting steel bars, a plurality of the connecting steel bars and a plurality of the upper connecting sleeves are provided in a one-to-one correspondence. The upper part of the connecting steel bar passes through the upper pile end plate and is detachably installed in the upper connecting sleeve of the upper pile end plate. The lower part of the connecting steel bar passes through the lower pile end plate and is fixed to the lower connecting sleeve of the lower pile end plate. The lower end face of the upper pile end plate is in contact with the upper end face of the lower pile end plate.

[0009] As an optional solution, a plurality of first mounting holes are provided on the upper pile end plate, and the plurality of first mounting holes are arranged in a circular array along the center line of the upper pile end plate;

[0010] Each of the first mounting holes includes a first through hole, a second through hole, and a first connecting through hole. The first connecting through hole connects the first through hole and the second through hole. The distance between the two inner side walls of the first connecting through hole is the same as the diameter of the second through hole. The diameter of the first through hole is larger than the diameter of the second through hole.

[0011] One end of the first longitudinal steel bar passes through the second through hole. The end of the first longitudinal steel bar passing through the second through hole is fixedly connected to a first pier. The diameter of the first pier is larger than the diameter of the first longitudinal steel bar, and the diameter of the first pier is smaller than the diameter of the first through hole. The diameter of the first longitudinal steel bar is the same as the diameter of the second through hole.

[0012] The second through hole has a first countersunk hole on the side wall at the end away from the upper pile. The first countersunk hole is adapted to the first pier head so that the first pier head can be installed in the first countersunk hole.

[0013] The lower pile end plate is provided with a plurality of second mounting holes, which correspond one-to-one with a plurality of first mounting holes, and the plurality of second mounting holes are arranged in a circular array along the center line of the lower pile end plate.

[0014] Each of the second mounting holes includes a third through hole, a fourth through hole, and a second connecting through hole. The second connecting through hole connects the third through hole and the fourth through hole. The distance between the two inner side walls of the second connecting through hole is the same as the diameter of the fourth through hole. The diameter of the third through hole is larger than the diameter of the fourth through hole.

[0015] One end of the second longitudinal steel bar passes through the fourth through hole. The end of the second longitudinal steel bar passing through the fourth through hole is fixedly connected to a second pier. The diameter of the second pier is larger than the diameter of the second longitudinal steel bar, and the diameter of the second pier is smaller than the diameter of the third through hole. The diameter of the second longitudinal steel bar is the same as the diameter of the fourth through hole.

[0016] The fourth through hole has a second countersunk hole on the side wall away from the lower pile section. The second countersunk hole is adapted to the second pier head so that the second pier head can be installed in the second countersunk hole.

[0017] As an optional solution, several of the upper connecting sleeves correspond one-to-one with several first mounting holes on the upper pile end plate, and each of the upper connecting sleeves has a first threaded hole at its lower end and is closed at its upper end.

[0018] The first threaded hole on the upper connecting sleeve is connected to the first through hole, the center line of the upper connecting sleeve coincides with the center line of the first through hole, and the nominal diameter of the first threaded hole in the upper connecting sleeve is the same as the diameter of the first through hole.

[0019] The lower connecting sleeves correspond one-to-one with the second mounting holes on the lower pile end plate. Each lower connecting sleeve has a second threaded hole at its upper end and is closed at its lower end.

[0020] The second threaded hole on the lower connecting sleeve is connected to the third through hole, the center line of the lower connecting sleeve coincides with the center line of the third through hole, and the nominal diameter of the second threaded hole in the lower connecting sleeve is the same as the diameter of the third through hole.

[0021] A third countersunk hole is provided on the side wall of the third through hole away from the lower pile section, and the diameter of the third countersunk hole is larger than the diameter of the third through hole.

[0022] As an optional solution, each of the connecting steel bars includes a first steel bar segment and a second steel bar segment, the lower end of the first steel bar segment is fixedly installed on the upper end of the second steel bar segment, and the center line of the first steel bar segment coincides with the center line of the second steel bar segment.

[0023] The first reinforcing bar segment has a third thread on its side wall away from the second reinforcing bar segment, and the third thread is adapted to the first threaded hole.

[0024] As an alternative, the diameter of the first reinforcing bar segment is larger than the diameter of the second reinforcing bar segment, and the second reinforcing bar segment has a fourth thread on its sidewall away from the first reinforcing bar segment, the nominal diameter of the fourth thread being smaller than the diameter of the second threaded hole.

[0025] As an alternative, the first steel bar segment passes through the first through hole on the end plate of the upper pile and is then turned into the first threaded hole of the upper connecting sleeve through the third thread.

[0026] As an alternative, the second steel bar segment passes through the third through hole on the end plate of the lower pile and is then inserted into the second threaded hole of the lower connecting sleeve.

[0027] As an optional solution, grout is injected into the second threaded hole of the lower connecting sleeve into which the second reinforcing bar segment is inserted.

[0028] As an optional solution, the height of the first steel bar segment is a, and the sum of the heights of the upper pile end plate and the first threaded hole in the upper connecting sleeve is b, where a≤b;

[0029] The height of the second reinforcing bar segment is c, and the sum of the heights of the lower pile end plate and the second threaded hole in the lower connecting sleeve is d, where c ≤ d.

[0030] As described above, the pile connection structure of this utility model has at least the following beneficial effects:

[0031] 1. In this utility model, when connecting the upper and lower pile sections, the upper part of the connecting steel bar is inserted into the upper connecting sleeve, and the lower part is inserted into the lower connecting sleeve. After connection, the lower end face of the upper pile end plate and the upper end face of the lower pile end plate remain in contact, so that the connecting steel bar is connected inside the upper and lower pile end plates and will not come into contact with the outside air. This makes the connecting steel bar less prone to rusting in humid and corrosive environments, thus ensuring that the upper and lower pile sections can be used normally for a long time after connection.

[0032] 2. In this invention, when connecting the lower and upper pile sections, a specified amount of grout is injected into several second threaded holes. After the connecting steel bar is inserted, the grout will wrap around the side wall of the second steel bar section. Since the second steel bar section has a second thread, the second thread increases the contact area between the second steel bar section and the grout, so that the grout can firmly adhere to the second steel bar section after solidification. Moreover, after the connecting steel bar is inserted, the grout will overflow to be flush with the upper end face of the second countersunk hole, thereby increasing the contact area between the grout and the lower pile end plate. After the grout solidifies, it can firmly adhere to the lower pile end plate, increasing the pull-out resistance between the lower and upper pile sections.

[0033] 3. The height of the second reinforcing bar segment in this utility model is c, and the sum of the heights of the lower pile end plate and the second threaded hole in the lower connecting sleeve is d. When c=d, the connecting reinforcing bar can be controlled to stop rotating when the lower end face of the first reinforcing bar segment is flush with the lower end face of the first through hole on the upper pile end plate. Then, after the connecting reinforcing bar is inserted into the second threaded hole in the lower connecting sleeve, the lower end face of the second reinforcing bar segment can be inserted into and fit against the lower end face in the second threaded hole. At this time, the area of ​​the grout in the second threaded hole covering the second reinforcing bar segment is maximized, and the lower end face of the upper pile end plate and the upper end face of the lower pile end plate are just in contact, thereby ensuring the stability of the lower pile segment after it is connected to the upper pile segment. Attached Figure Description

[0034] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0035] Figure 2 The diagram shows the internal structure of the upper and lower pile sections of this utility model.

[0036] Figure 3 The diagram shows the structure of the upper pile end plate and the upper connecting sleeve of this utility model.

[0037] Figure 4 This is shown as the present invention. Figure 3 A magnified view of point A in the image;

[0038] Figure 5 The diagram shows the structure of the lower pile end plate and the lower connecting sleeve of this utility model.

[0039] Figure 6 This is shown as the present invention. Figure 5 A magnified view of section B in the image;

[0040] Figure 7 The diagram shows the structure of the first and second piers of this utility model during the installation process.

[0041] Figure 8 The diagram shows the height of the first reinforcing bar segment, the sum of the heights of the upper pile end plate and the first threaded hole in the upper connecting sleeve, the height of the second reinforcing bar segment, and the sum of the heights of the lower pile end plate and the second threaded hole in the lower connecting sleeve of this utility model.

[0042] Figure 9 The diagram shown is an exploded view of the first and second threaded holes of this utility model.

[0043] Figure 10 This is a three-dimensional structural diagram of the upper and lower pile sections of this utility model when they are connected.

[0044] In the diagram: 101, upper pile end plate; 102, upper connecting sleeve; 103, first through hole; 104, second through hole; 105, first connecting through hole; 106, first longitudinal reinforcement; 107, first pier head; 108, first countersunk hole; 109, first threaded hole; 110, upper pile section;

[0045] 201. Lower pile end plate; 202. Lower connecting sleeve; 203. Third through hole; 204. Fourth through hole; 205. Second connecting through hole; 206. Second longitudinal reinforcement; 207. Second pier head; 208. Second countersunk hole; 209. Second threaded hole; 210. Third countersunk hole; 211. Lower pile section;

[0046] 301, First reinforcing bar segment; 302, Second reinforcing bar segment; 303, Third thread; 304, Fourth thread. Detailed Implementation

[0047] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0048] Please see Figures 1 to 10It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0049] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0050] Please see Figure 1 , Figure 2 and Figure 10 This utility model provides a pile-to-pile connection structure, the pile-to-pile connection structure comprising:

[0051] The upper pile end plate 101 and several upper connecting sleeves 102 are installed on the lower end face of the upper pile 110, and several upper connecting sleeves 102 are fixedly installed on the upper end face of the upper pile end plate 101. The several connecting sleeves are arranged in a circular array along the center line of the upper pile end plate 101.

[0052] The lower pile end plate 201 and a plurality of lower connecting sleeves 202 are provided. The plurality of lower connecting sleeves 202 and the plurality of upper connecting sleeves 102 correspond one-to-one. The lower pile end plate 201 is installed on the upper end face of the lower pile section 211. The center line of the lower pile section 211 coincides with the center line of the upper pile section 110. The plurality of lower connecting sleeves 202 are fixedly installed on the lower end face of the lower pile end plate 201. The plurality of connecting sleeves are arranged in a circular array along the center line of the lower pile end plate 201.

[0053] A plurality of connecting steel bars are provided, and a plurality of the connecting steel bars and a plurality of the upper connecting sleeves 102 are provided in a one-to-one correspondence. The upper part of the connecting steel bar passes through the upper pile end plate 101 and is detachably installed in the upper connecting sleeve 102 of the upper pile end plate 101. The lower part of the connecting steel bar passes through the lower pile end plate 201 and is fixed to the lower connecting sleeve 202 of the lower pile end plate 201. The lower end face of the upper pile end plate 101 is in contact with the upper end face of the lower pile end plate 201.

[0054] In this embodiment, when it is necessary to connect the upper pile 110 and the lower pile 211 together, the lower pile 211 is fixed in a position with the lower pile end plate 201 facing upward. The upper part of several connecting steel bars is inserted through the upper pile end plate 101 and fixedly installed in the upper connecting sleeve 102. The upper pile 110 is moved to the position directly above the lower pile 211 by a crane. Then, the upper pile 110 is moved downward by a crane so that the connecting steel bars are inserted through the lower pile end plate 201 and fixed in the lower connecting sleeve 202. During fixing, the lower end face of the upper pile end plate 101 and the upper end face of the lower pile end plate 201 are in contact.

[0055] When the upper pile 110 and the lower pile 211 of this utility model are connected, the connecting steel bars will not be exposed. After the connection, the lower end face of the upper pile end plate 101 and the upper end face of the lower pile end plate 201 remain in contact, so that the connecting steel bars will not come into contact with the outside air, making them less prone to rusting in humid and corrosive environments. This ensures that the upper pile 110 and the lower pile 211 can be used for a long time after they are connected.

[0056] Please see Figures 1 to 7 The upper pile end plate 101 is provided with a plurality of first mounting holes, and the plurality of first mounting holes are arranged in a circular array along the center line of the upper pile end plate 101.

[0057] Each of the first mounting holes includes a first through hole 103, a second through hole 104, and a first connecting through hole 105. The first connecting through hole 105 connects the first through hole 103 and the second through hole 104. The distance between the two inner side walls of the first connecting through hole 105 is the same as the diameter of the second through hole 104. The diameter of the first through hole 103 is larger than the diameter of the second through hole 104.

[0058] One end of the first longitudinal steel bar 106 passes through the second through hole 104. The end of the first longitudinal steel bar 106 passing through the second through hole 104 is fixedly connected to a first pier 107. The diameter of the first pier 107 is larger than the diameter of the first longitudinal steel bar 106, and the diameter of the first pier 107 is smaller than the diameter of the first through hole 103. The diameter of the first longitudinal steel bar 106 is the same as the diameter of the second through hole 104.

[0059] The second through hole 104 has a first countersunk hole 108 on the side wall away from the upper pile 110. The first countersunk hole 108 is adapted to the first pier head 107 so that the first pier head 107 can be installed in the first countersunk hole 108.

[0060] The lower pile end plate 201 is provided with a plurality of second mounting holes, and the plurality of second mounting holes correspond one-to-one with the plurality of first mounting holes. The plurality of second mounting holes are arranged in a circular array along the center line of the lower pile end plate 201.

[0061] Each of the second mounting holes includes a third through hole 203, a fourth through hole 204, and a second connecting through hole 205. The second connecting through hole 205 connects the third through hole 203 and the fourth through hole 204. The distance between the two inner side walls of the second connecting through hole 205 is the same as the diameter of the fourth through hole 204. The diameter of the third through hole 203 is larger than the diameter of the fourth through hole 204.

[0062] One end of the second longitudinal steel bar 206 passes through the fourth through hole 204. The end of the second longitudinal steel bar 206 passing through the fourth through hole 204 is fixedly connected to a second pier 207. The diameter of the second pier 207 is larger than the diameter of the second longitudinal steel bar 206, and the diameter of the second pier 207 is smaller than the diameter of the third through hole 203. The diameter of the second longitudinal steel bar 206 is the same as the diameter of the fourth through hole 204.

[0063] The fourth through hole 204 has a second countersunk hole 208 on the side wall away from the lower pile 211. The second countersunk hole 208 is adapted to the second pier head 207 so that the second pier head 207 can be installed in the second countersunk hole 208.

[0064] In this embodiment, the upper pile end plate 101 is fixedly installed on the lower end face of the upper pile 110 by the following method during the integral forming process of the upper pile end plate 101 and the upper pile 110: the first longitudinal steel bar 106 passes through the first through hole 103 and then moves laterally from the first connecting through hole 105 to the second through hole 104. Then the first pier head 107 is moved into the first countersunk hole 108. After the upper pile 110 is formed, the upper pile end plate 101 is fixedly connected to the upper pile 110 through the first longitudinal steel bar 106.

[0065] The lower pile end plate 201 is fixedly installed on the upper end face of the lower pile 211 by the following process during the integral forming of the lower pile end plate 201 and the lower pile 211: the second longitudinal steel bar 206 passes through the third through hole 203 and then moves laterally from the second connecting through hole 205 to the fourth through hole 204. Then the second pier head 207 is moved into the second countersunk hole 208. After the lower pile 211 is formed, the lower pile end plate 201 is fixedly connected to the lower pile 211 through the second longitudinal steel bar 206.

[0066] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9 Each of the upper connecting sleeves 102 corresponds one-to-one with a number of first mounting holes on the upper pile end plate 101. Each of the upper connecting sleeves 102 has a first threaded hole 109 at its lower end and is closed at its upper end.

[0067] The first threaded hole 109 on the upper connecting sleeve 102 is connected to the first through hole 103. The center line of the upper connecting sleeve 102 coincides with the center line of the first through hole 103, and the nominal diameter of the first threaded hole 109 in the upper connecting sleeve 102 is the same as the diameter of the first through hole 103.

[0068] A plurality of the lower connecting sleeves 202 correspond one-to-one with a plurality of second mounting holes on the lower pile end plate 201. Each of the lower connecting sleeves 202 has a second threaded hole 209 at its upper end and is closed at its lower end.

[0069] The second threaded hole 209 on the lower connecting sleeve 202 is connected to the third through hole 203. The center line of the lower connecting sleeve 202 coincides with the center line of the third through hole 203, and the nominal diameter of the second threaded hole 209 in the lower connecting sleeve 202 is the same as the diameter of the third through hole 203.

[0070] A third countersunk hole 210 is provided on the side wall of the third through hole 203 away from the lower pile 211. The diameter of the third countersunk hole 210 is larger than the diameter of the third through hole 203.

[0071] In this embodiment, the upper pile end plate 101 is fixedly installed on the lower end face of the upper pile 110 by first passing through the first through hole 103 and then moving laterally from the first connecting through hole 105 to the second through hole 104 during the integral forming process of the upper pile end plate 101 and the upper pile 110. Then, the first pier head 107 is moved into the first countersunk hole 108. After that, several upper connecting sleeves 102 are welded to the upper end face of the upper pile end plate 101, so that the first threaded hole 109 of the upper connecting sleeve 102 and the first through hole 103 on the upper pile end plate 101 are connected. After the upper pile 110 is formed, the upper pile end plate 101 is fixedly connected to the upper pile 110 through the first longitudinal steel bar 106, and the upper connecting sleeve 102 is embedded in the upper pile 110.

[0072] The lower pile end plate 201 is fixedly installed on the upper end face of the lower pile section 211 by first passing the second longitudinal steel bar 206 through the third through hole 203 and then moving it laterally from the second connecting through hole 205 to the fourth through hole 204 during the integral forming process of the lower pile end plate 201 and the lower pile section 211. Then, the second pier head 207 is moved into the second countersunk hole 208. After that, several lower connecting sleeves 202 are welded to the lower end face of the lower pile end plate 201, so that the second threaded hole 209 of the lower connecting sleeve 202 and the third through hole 203 on the upper pile end plate 101 are connected. After the lower pile section 211 is formed, the lower pile end plate 201 is fixedly connected to the lower pile section 211 through the second longitudinal steel bar 206, and the lower connecting sleeve 202 is embedded in the lower pile section 211.

[0073] Please see Figure 2 and Figure 9 Each of the connecting steel bars includes a first steel bar segment 301 and a second steel bar segment 302. The lower end of the first steel bar segment 301 is fixedly installed on the upper end of the second steel bar segment 302. The center line of the first steel bar segment 301 coincides with the center line of the second steel bar segment.

[0074] The first reinforcing bar segment 301 has a third thread 303 on its side wall away from the second reinforcing bar segment 302, and the third thread 303 is adapted to the first threaded hole 109.

[0075] In this embodiment, before installing the upper pile 110 into the lower pile 211, the first steel bar segment 301 of the connecting steel bar is passed through the first through hole 103 on the upper pile end plate 101 and then turned into the first threaded hole 109 of the upper connecting sleeve 102 through the third thread 303 until all the first threaded holes 109 of the upper connecting sleeve 102 are threadedly connected by the first steel bar segments 301 of several connecting steel bars, and then waits for subsequent operations.

[0076] The first steel bar segment 301 of the connecting steel bar of this utility model can be threadedly connected to the first threaded hole 109 of the upper connecting package, which facilitates the installation and use of the connecting steel bar.

[0077] Please see Figure 9 The diameter of the first reinforcing bar segment 301 is greater than the diameter of the second reinforcing bar segment 302. The second reinforcing bar segment 302 has a fourth thread 304 on its side wall away from the first reinforcing bar segment 301. The nominal diameter of the fourth thread 304 is smaller than the diameter of the second threaded hole 209.

[0078] In this embodiment, when it is necessary to connect the upper pile 110 and the lower pile 211 together, the lower pile 211 is fixed in a position with the lower pile end plate 201 facing upward. The first steel bar segments 301 of several connecting steel bars are threaded through the upper pile end plate 101 and then threaded into the first threaded holes 109 of several upper connecting sleeves 102. Then, the upper pile 110 is moved to the position directly above the lower pile 211 by a crane and then moved downward, so that the connecting steel bars are inserted into the second threaded holes 209 on the lower connecting sleeve 202 and fixed after passing through the lower pile end plate 201.

[0079] Please see Figure 2 and Figure 9 The first steel bar segment 301 passes through the first through hole 103 on the end plate 101 of the upper pile and then rotates into the first threaded hole 109 of the upper connecting sleeve 102 through the third thread 303.

[0080] In this embodiment, after the first steel bar segment 301 of the connecting steel bar passes through the first through hole 103 on the upper pile end plate 101 and is turned into the first threaded hole 109 of the upper connecting sleeve 102 through the third thread 303, the lower end face of the first steel bar segment 301 is not lower than the lower end face of the first through hole 103.

[0081] Please see Figure 2 , Figure 8 and Figure 9 The second steel bar segment 302 passes through the third through hole 203 on the lower pile end plate 201 and is then inserted into the second threaded hole 209 of the lower connecting sleeve 202.

[0082] In this embodiment, after the second steel bar segment 302 of the connecting steel bar passes through the third through hole 203 on the lower pile end plate 201 and is inserted into the second threaded hole 209 of the lower connecting sleeve 202, the upper end face of the second steel bar segment 302 is not lower than the upper end face of the third through hole 203.

[0083] Please see Figure 9 Grout is injected into the second threaded hole 209 of the lower connecting sleeve 202 into the second reinforcing bar segment 302.

[0084] In this embodiment, when it is necessary to connect the upper pile 110 and the lower pile 211 together, the lower pile 211 is fixed in a position with the lower pile end plate 201 facing upward. The first steel bar segment 301 of several connecting steel bars passes through the upper pile end plate 101 and is threaded into the first threaded hole 109 of the upper connecting sleeve 102. A specified amount of grout is injected into several second threaded holes 209. Then, the upper pile 110 is moved to directly above the lower pile 211 by a crane and then moved downward, so that the connecting steel bar passes through the lower pile end plate 201 and is inserted into the grout in the second threaded hole 209 of the lower connecting sleeve 202. After insertion, the grout overflows to be flush with the upper end face of the second countersunk hole 208. The lower end face of the upper pile end plate 101 and the upper end face of the lower pile end plate 201 are in contact. The grout solidifies after a certain period of time, thereby fixing the upper pile 110 and the lower pile 211 that are connected vertically.

[0085] In this invention, when connecting the lower pile 211 and the upper pile 110, a specified amount of grout is injected into several second threaded holes 209. After the connecting steel bar is inserted, the grout will wrap around the side wall of the second steel bar segment 302. Since the second steel bar segment 302 is provided with a fourth thread 304, the fourth thread 304 increases the contact area between the second steel bar segment 302 and the grout, so that the grout can be firmly bonded to the second steel bar segment 302 after solidification. Moreover, after the connecting steel bar is inserted, the grout will overflow to be flush with the upper end face of the second countersunk hole 208, thereby increasing the contact area between the grout and the lower pile end plate 201. After the grout solidifies, it can be firmly bonded to the lower pile end plate 201, increasing the pull-out resistance between the lower pile 211 and the upper pile 110.

[0086] Please see Figure 8 The height of the first steel bar segment 301 is a, and the sum of the heights of the upper pile end plate 101 and the first threaded hole 109 inside the upper connecting sleeve 102 is b, where a≤b;

[0087] The height of the second steel bar segment 302 is c, and the sum of the heights of the lower pile end plate 201 and the second threaded hole 209 inside the lower connecting sleeve 202 is d, where c≤d.

[0088] In this embodiment, when c=d, after the first steel bar segment 301 of the connecting steel bar passes through the first through hole 103 on the upper pile end plate 101 and is rotated into the first threaded hole 109 of the upper connecting sleeve 102, the rotation stops when the lower end face of the first steel bar segment 301 is flush with the lower end face of the first through hole 103 on the upper pile end plate 101. A specified amount of grout is injected into several second threaded holes 209. After the connecting steel bar passes through the third through hole 203 on the lower pile end plate 201 and is inserted into the second threaded hole 209 in the lower connecting sleeve 202, the lower end face of the second steel bar segment 302 is in contact with the lower end face of the second threaded hole 209. The grout overflows to be flush with the upper end face of the second countersunk hole 208 after the connecting steel bar is inserted. At this time, the lower end face of the upper pile end plate 101 and the upper end face of the lower pile end plate 201 remain in contact.

[0089] When c < d, when the first steel bar segment 301 of the connecting steel bar penetrates through the first through hole 103 on the upper pile end plate 101 and then is turned into the first threaded hole 109 of the upper connecting sleeve 102, when it is turned until the lower end surface of the first steel bar segment 301 is flush with the lower end surface of the first through hole 103 on the upper pile end plate 101, stop turning. Inject a specified amount of slurry into each of the several second threaded holes 209. Then, after the connecting steel bar passes through the third through hole 203 on the lower pile end plate 201 and is inserted into the second threaded hole 209 in the lower connecting sleeve 202 until the lower end surface of the upper pile end plate 101 is in contact with the upper end surface of the lower pile end plate 201, the lower end surface of the second steel bar segment 302 is higher than the lower end surface in the second threaded hole 209. The slurry will overflow to be flush with the upper end surface of the second counterbore 208 after the connecting steel bar is inserted.

[0090] In the present utility model, when c = d, it can be controlled that when the connecting steel bar is turned until the lower end surface of the first steel bar segment 301 is flush with the lower end surface of the first through hole 103 on the upper pile end plate 101, stop turning. Then, after the connecting steel bar is inserted into the second threaded hole 209 in the lower connecting sleeve 202, the lower end surface of the second steel bar segment 302 can be inserted to fit with the lower end surface of the second threaded hole 209. At this time, while the area of the slurry in the second threaded hole 209 wrapping the second steel bar segment 302 is the largest, the lower end surface of the upper pile end plate 101 is just in contact with the upper end surface of the lower pile end plate 201, so as to ensure the stability after the lower pile 211 and the upper pile 110 are connected.

[0091] The above embodiments only illustratively explain the principles and effects of the present utility model, rather than being used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A pile-to-pile connection structure, characterized in that, The pile connection structure includes: The upper pile end plate and several upper connecting sleeves are provided. The upper pile end plate is installed on the lower end face of the upper pile section, and several upper connecting sleeves are fixedly installed on the upper end face of the upper pile end plate. The several connecting sleeves are arranged in a circular array along the center line of the upper pile end plate. The pile end plate and several lower connecting sleeves are provided. The several lower connecting sleeves correspond one-to-one with the several upper connecting sleeves. The pile end plate is installed on the upper end face of the pile section. The center line of the pile section coincides with the center line of the pile section. Several lower connecting sleeves are fixedly installed on the lower end face of the pile end plate. The several connecting sleeves are arranged in a circular array along the center line of the pile end plate. A plurality of connecting steel bars, a plurality of the connecting steel bars and a plurality of the upper connecting sleeves are provided in a one-to-one correspondence. The upper part of the connecting steel bar passes through the upper pile end plate and is detachably installed in the upper connecting sleeve of the upper pile end plate. The lower part of the connecting steel bar passes through the lower pile end plate and is fixed to the lower connecting sleeve of the lower pile end plate. The lower end face of the upper pile end plate is in contact with the upper end face of the lower pile end plate.

2. The pile connection structure according to claim 1, characterized in that: The upper pile end plate is provided with a plurality of first mounting holes, which are arranged in a circular array along the center line of the upper pile end plate. Each of the first mounting holes includes a first through hole, a second through hole, and a first connecting through hole. The first connecting through hole connects the first through hole and the second through hole. The distance between the two inner side walls of the first connecting through hole is the same as the diameter of the second through hole. The diameter of the first through hole is larger than the diameter of the second through hole. One end of the first longitudinal steel bar passes through the second through hole. The end of the first longitudinal steel bar passing through the second through hole is fixedly connected to a first pier. The diameter of the first pier is larger than the diameter of the first longitudinal steel bar, and the diameter of the first pier is smaller than the diameter of the first through hole. The diameter of the first longitudinal steel bar is the same as the diameter of the second through hole. The second through hole has a first countersunk hole on the side wall at the end away from the upper pile section. The first countersunk hole is adapted to the first pier head so that the first pier head can be installed in the first countersunk hole. The lower pile end plate is provided with a plurality of second mounting holes, which correspond one-to-one with a plurality of first mounting holes, and the plurality of second mounting holes are arranged in a circular array along the center line of the lower pile end plate. Each of the second mounting holes includes a third through hole, a fourth through hole, and a second connecting through hole. The second connecting through hole connects the third through hole and the fourth through hole. The distance between the two inner side walls of the second connecting through hole is the same as the diameter of the fourth through hole. The diameter of the third through hole is larger than the diameter of the fourth through hole. One end of the second longitudinal steel bar passes through the fourth through hole. The end of the second longitudinal steel bar passing through the fourth through hole is fixedly connected to a second pier. The diameter of the second pier is larger than the diameter of the second longitudinal steel bar, and the diameter of the second pier is smaller than the diameter of the third through hole. The diameter of the second longitudinal steel bar is the same as the diameter of the fourth through hole. The fourth through hole has a second countersunk hole on the side wall away from the lower pile section. The second countersunk hole is adapted to the second pier head so that the second pier head can be installed in the second countersunk hole.

3. The pile connection structure according to claim 2, characterized in that: Each of the aforementioned upper connecting sleeves corresponds one-to-one with a number of first mounting holes on the upper pile end plate. Each of the aforementioned upper connecting sleeves has a first threaded hole at its lower end and is closed at its upper end. The first threaded hole on the upper connecting sleeve is connected to the first through hole, the center line of the upper connecting sleeve coincides with the center line of the first through hole, and the nominal diameter of the first threaded hole in the upper connecting sleeve is the same as the diameter of the first through hole. The lower connecting sleeves correspond one-to-one with the second mounting holes on the lower pile end plate. Each lower connecting sleeve has a second threaded hole at its upper end and is closed at its lower end. The second threaded hole on the lower connecting sleeve is connected to the third through hole, the center line of the lower connecting sleeve coincides with the center line of the third through hole, and the nominal diameter of the second threaded hole in the lower connecting sleeve is the same as the diameter of the third through hole. A third countersunk hole is provided on the side wall of the third through hole away from the lower pile section, and the diameter of the third countersunk hole is larger than the diameter of the third through hole.

4. The pile connection structure according to claim 3, characterized in that: Each of the connecting steel bars includes a first steel bar segment and a second steel bar segment. The lower end of the first steel bar segment is fixedly installed on the upper end of the second steel bar segment, and the center line of the first steel bar segment coincides with the center line of the second steel bar segment. The first reinforcing bar segment has a third thread on its side wall away from the second reinforcing bar segment, and the third thread is adapted to the first threaded hole.

5. The pile connection structure according to claim 4, characterized in that: The diameter of the first reinforcing bar segment is greater than the diameter of the second reinforcing bar segment. The second reinforcing bar segment has a fourth thread on its side wall away from the first reinforcing bar segment. The nominal diameter of the fourth thread is smaller than the diameter of the second threaded hole.

6. The pile connection structure according to claim 4, characterized in that: After the first steel bar segment passes through the first through hole on the end plate of the upper pile, it is turned into the first threaded hole of the upper connecting sleeve through the third thread.

7. The pile connection structure according to claim 4, characterized in that: The second steel bar segment passes through the third through hole on the end plate of the lower pile and is then inserted into the second threaded hole of the lower connecting sleeve.

8. The pile connection structure according to claim 4, characterized in that: Grout is injected into the second threaded hole of the lower connecting sleeve into which the second steel bar segment is inserted.

9. A pile connection structure according to claim 4, characterized in that: The height of the first steel bar segment is a, and the sum of the heights of the upper pile end plate and the first threaded hole in the upper connecting sleeve is b, where a≤b; The height of the second reinforcing bar segment is c, and the sum of the heights of the lower pile end plate and the second threaded hole in the lower connecting sleeve is d, where c ≤ d.

Images